Economic Botany 41(2), 1987, pp. 283-291.
L.J. VALDÉS III,2,3 G.M. HATFIELD,2 M. KOREEDA,3 and A.G. PAUL2
-------------------------------------------------------
1Received 3 November 1986; accepted 2 February 1987
2College of Pharmacy and 3Department of Chemistry, the University of Michigan,
Ann Arbor, MI 48109.
Salvia divinorum Epling & Játiva-M. is one of the vision-inducing plants used by
the Mazatec Indians of central Mexico. The present status of research is
summarized. Experiments with material collected at different Oaxacan sites
confirmed that the mint has white (rather than blue) flowers with a purple calyx
and that flowering is induced by short daylength.
Fig 1. Salvia divinorum flowering in a coffee plantation on Cerro Quemado,
Oaxaca (2 Mar 1980). Plant height 1 m. Fig. 2. S. divinorum at Matthaei
Botanical Gardens (21 Nov 1980). Plant height 2.3 m. Fig. 3 Seeds of S.
divinorum. Scale markings: 1mm.
Spanish conquistadores arriving in Mexico during the 16th
century noted native medico-religious uses of vision inducing plants such as
peyotl (peyote, Lophophora williamsii (Lem. ex Salm-Dyck) Coult.), teonanactl
(Psilocybe and related mushrooms), ololiuqui (the morning glories, Turbina
corymbosa (L.) Raf. and Ipomoea violacea L.) and others (Bourke 1891; Schultes
and Hoffman 1980; Urbina 1899; 1903). The New World came under the jurisdiction
of the flourishing Spanish Inquisition, and Indian utilization of hallucinogenic
plants was anathematic to the clergy (Aguirre Beltrán 1973). The identities of
teonanactl (flesh of the gods) and ololiuhqui were forgotten for centuries (Schultes
1941b; Wasson and Wasson 1957). Expeditions to remote areas of central Mexico
during the 1930s found that isolated peoples, including the Mazatecs of
Northeastern Oaxaca, had continued to use hallucinogenic plants in ritual
healing (Reko 1945; Schultes 1941a). The investigations of Wasson and colleagues
were largely responsible for the introduction of Mazatec psychotropic plants to
the outside world (Heim and Wasson 1958; Wasson 1962, 1963, 1980; Wasson and
Wasson 1957; Wasson et al. 1974).
Along with rediscovery of ritual employment of mushrooms and morning-glory
seeds, investigators reported the use of another divinatory plant by the Mazatec
Indians. Johnson (1939) noted a vision inducing "tea" prepared from the leaves
of an hierba María (the Virgin Mary's herb). Reko (1945) cryptically referred
some unidentifiable leaves he collected in the Sierra Mazateca. Weitlaner (1952)
described a ceremony using a "yerba de María". In 1957 Gómez Pompa collected
non-flowering specimens (AGP 87556 and 93216, MEXU) of a purportedly
hallucinogenic Salvia known as xka (ska) Pastora (the leaves of the
shepherdess). Later, Wasson and Hoffman obtained a flowering specimen without
visiting the collection site (Hoffman 1980; Wasson 1962). They gave the plant to
Carl Epling, who had revised the New World Salvia subgenus Calosphace (Epling
1939). Epling and Játiva-M. assigned this new species, Salvia divinorum Epling
and Játiva-M. (Lamiaceae), to section Dusenostachys (containing about 10 other
species) (Fig. 1-3).
MAZATEC USE OF SALVIA DIVINORUM
There is little information concerning the Mazatec's existence before arrival of
the Spaniards. Twenty thousand people, Including Don Alejandro Vicente, a
curandero (healer) who was our informant, were forced to leave their homelands
upon construction of the Miguel Alemán Dam during the 1950's (Barabas and
Bartolomé 1973; Benitez 1973; Estrada 1977; Munn 1979; Villa-Rojas 1955;
Weitlaner and Hoppe 1969). Don Alejandro told us that he used S. divinorum in
ritual divination and curing (Valdés et al 1983). The foliage is gathered as
needed (it purportedly loses psychotropic activity on drying), although it may
be wrapped in leaves of Xanthosoma robustum Schoff (and other spp.) to keep it
fresh for a week. Only the leaves are employed in the preparation of medicines;
a dose is measured by counting them out in pairs. Taken in small doses (an
infusion prepared from four or five pairs of fresh or dried leaves), the plant
acts as what we interpreted to be a tonic or panacea. It purportedly regulates
eliminatory functions (defecation and urination) and cures "anemia," "headache,"
and "rheumatism." It also "cures" the disease "panzón de barrego," translated as
a swollen belly caused by a sorcerer's evil curse. In large doses (an infusion
made from 20 to over 60 pairs of fresh leaves) the plant acts as a mild but
effective hallucinogen. The leaves may be eaten entire (Cortés 1979; Wasson
1962), but they are often crushed in water to prepare an infusion, which is then
drunk (Hofmann 1980; Valdés 1983; Valdés et al. 1983; Wasson, 1962). The
infusion is often preferred to taking the leaves due to their extreme bitterness
(our chemical investigations indicated this is probably due to high
concentrations of water soluble tannins). Depending on the type of cure, ska
María Pastora may be taken by the patient, the curandero, or both.
The Mazatec names for S. divinorum associate it with the Virgin Mary. When it is
taken to induce a visionary experience, the "timidness of Mary" supposedly
allows the vision to take place only in quiet or darkness. Given the Salvia
infusion at Don Alejandro's home, Valdés (1983; Valdés et al. 1983) noted that
village noises prevented full manifestations of its effects. However, on
returning to the room where the researchers were staying, he underwent an
experience that surprised him by the vividness of its apparent "reality." He
found himself in an open meadow conversing with and holding on to a being in a
white robe. It was an astounding visual, oral/aural, and tactile hallucination.
Don Alejandro said the effects of the Salvia were similar to those produced by
ingestion of morning-glory seeds. Taking an infusion of the morning-glory seeds
under Don Alejandro's supervision at a later date, Valdés noted parallels
between the two experiences. Both had a duration of several hours, and the
subject eventually drifted off to sleep. A side effect common to both
experiences is muscular incoordination. Because both plants are psychotropically
weaker than vision inducing mushrooms, Don Alejandro used them to a greater
extent, since he felt they were less "dangerous." He told us that after becoming
experienced with the Salvia, a prospective curandero progresses to the
morning-glory seeds and finally to the mushrooms. The obscurity of this mint,
its bitter taste, and a misunderstanding of its psychotropic effects have kept
it from becoming a recreational drug (Díaz 1975; Foster 1984; Hofmann 1980;
Valdés 1983; Valdés et al 1983; Wasson 1962). Díaz (1975) reported that young
people from Mexican cities travel to the Sierra Mazateca and purchase dried
leaves of S. divinorum to make into cigarettes and smoke as a marijuana
substitute. The effect is reportedly milder than that of Cannabis.
CHEMISTRY OF SALVIA DIVINORUM
Hofmann was the first to isolate and identify the psychoactive ingredients in
the Mexican mushrooms and morning-glory seeds. He later made chemical studies of
S. divinorum, but was unable to isolate and identify the compound(s) responsible
for the plant's activity in human beings (Hofmann 1964, 1980). Work by Díaz
(1975) suggested that the Salvia contained alkaloids. In 1980 we began a
bioassay directed analysis of leaves from plants grown at the Matthaei Botanical
Gardens. Two diterpenes (Fig. 4) were eventually isolated (Valdés et al. 1984);
one of them caused sedation in mice when tested in a modification of Hall's open
field (Brimnlecombe and Greene 1962; Ryall 1958; Turner 1965; Valdés 1983).
Normal mice remain active in the field for at least 30 min before finally
resting; however, those given intraperitoneal doses of compound 1 were sedated
in the field (compound 2 was inactive). Diterpene 1 is apparently not very
toxic, as we have given it intraperitoneally to mice in doses up to 1 g/kg with
apparent complete recovery after a few hours (the mice were observed for a week
without incident; no necropsies were performed). Since the mice obviously not
report "visions," we also dosed them with mescaline (an hallucinogen),
secobarbital (a sedative-hypnotic), a partially purified ether extract of
Cannabis sativa, and a pharmacologically active diterpene, forskolin. All
compounds produced a sedation in mice when tested in the open field; that
produced by mescaline was similar to the activity of the Salvia compound
(unpublished data).
|
|
Salvinorin A (1) |
Salvinorin B (2) |
Fig. 4.Salvinorins A (1) and B (2) isolated from S. divinorum.
We named the new terpenoids divinorins A (1) and B (2), but later found that
Ortega et al. (1982) previously isolated a compound, salvinorin, from S.
divinorum that was identical to 1. Therefore the diterpenes should be known as
salvinorins A and B respectively. In our studies of the mint's activity we
noticed that salvinorin A was not so active as partially purified Salvia
extracts in the open field. Further investigations have led to isolation of more
diterpenes structurally related to 1. We are presently in the process of
characterizing and testing these compounds for pharmacological activity. If
salvinorin A and the new compounds we isolated from the mint prove to display
hallucinogenic activity in humans, it will mean addition of a new class of
compounds (the terpenes) and eventually new plant genera to the psychotropic
pharmacopoeia. Diterpenes similar in structure to the salvinorins have been
isolated from the ornamental S. splendens (Savona et al. 1978, 1979), as well as
several other species of New World Salvia Although only a few of the several
hundred species in subgenus Calosphace have been chemically investigated to
date, diterpenes could prove to be very useful as chemotaxonomic markers in
determining relationships within the subgenus.
BOTANICAL OBSERVATIONS ON SALVIA DIVINORUM
Wasson (1963) suggested that S. divinorum might be the plant the Aztecs knew as
pipiltzintzintli ("most noble prince" or "venerable little children"); this name
has become associated with the mint in recent literature (Emboden 1979; Foster
1984; Schultes 1976). Aguirre Beltrán (1973) summarized the data on
pipiltzintzintli contained in the Inquisitorial Archives. It was apparently an
hallucinogenic plant that had male and female varieties. All plant parts,
including the roots and flowers were used medicinally (no mention was made of
the seeds), and it was cultivated for such purposes. Aguirre Beltrán, claiming
that pipiltzintzintli was actually ololiuhqui, presented a convincing argument
for his assumption. Investigators have shown that the leaves and stems (aerial
portions) of both Turbina corymbosa and Ipomoea violacea contain significant
amounts of the psychotropic alkaloids found in their seeds (Staba and Laursen
1966; Taber et al. 1963). Díaz (1979) cited a contemporary reference (Alzate
1772) that identified pipiltzintzintli as Cannabis. Although the morning-glories
and cannabis are likely candidates, a precise botanical identification of
pipiltzintzintli remains uncertain. Association of S. divinorum with the ancient
Aztec plant is tenuous at best.
In describing S. divinorum, Epling stated that the flowers had a blue calyx tube
and corolla, making an error that has endured in the literature (Foster 1984;
Schultes 1976; Schultes and Hofmann 1980). Epling had a living specimen that he
cultivated and presented to the botanical garden at the University of
California, Los Angeles (accession 63-104). A living sample of this material is
at the University of California, Berkeley (accession 76.100). After propagating
material from these collections, Emboden correctly described the flowers as
having a white corolla surrounded by a violet calyx (Emboden 1979, pers. comm.
1980). Until our expedition to Mexico, all S. divinorum growing in the United
States was apparently descended from this single specimen (B. Bartholomew, pers.
comm 1980; D.S. Verity, pers. comm. 1980; R.G. Wasson, pers. comm. 1980).
Salvia divinorum is reported to be a cultigen that rarely blooms (and then only
when the branches are over 7 ft long) and apparently never sets seed (Emboden
1979; Foster 1984; R. Ornduff pers. comm. 1980; Wasson 1962). Nothing is known
about natural pollinators, but the plant is parasitized by several species of
insects (Díaz 1975). Don Alejandro told us that ska María pastora could be found
over wide areas of the Mazatecan highlands. But Cerro Rabon is a tall (2,100 m)
and still relatively inaccessible mountain. Mazatecan legends consider it to be
a semidormant volcano, with a magical lake at its summit. It is supposedly
populated by local gods, demons and magical beings (Benitez 1973; Espinosa 1961;
Incháustegui 1977). Therefore, after observing the localities in which the
Salvia grew, we believe the mint is collected in the highlands and planted in
more accessible places, where it becomes naturalized. It is doubtful that the
Salvia is a true cultigen. Among flowering specimens we collected on Cerro
Quemado, one (Fig. 1) was only about 1 m tall. We saw remains of flower spikes
in a stand on Cerro Rabón near the village of Ayautla. Seeds (i.e., mericarps)
were not found at either site. During our conversations Don Alejandro told us
that the flowers produced seed that could be planted to grow the Salvia. While
growing it for chemical research, we performed experiments that clarified some
of the botanical questions surrounding the plant.
In addition to our collections of living specimens from both sites, we were able
to obtain cuttings of plants asexually propagated from the original specimen
obtained by Wasson and Hofmann in the village of San José Tenango, Oaxaca (B.
Bartholomew, pers comm. 1980; D.S. Verity, pers. comm 1980; R.G. Wasson pers.
comm. 1980). From herbarium sheets of Oaxacan collections, we noted that
flowering specimens were collected only between late August and March, a time of
short days (Valdés 1983). In Mexico City (which is not far north of the
collection localities), daylength reaches a maximum of 13h in June and decreases
to about 12 h in October (Salisbury and Ross 1978). Although most plants
affected by daylength need exposure to a certain critical dark period to begin
the development of flower buds, some need a tapered decrease in daylength to
induce flowering (Bickford and Dunn 1973). Using this information, we devised a
series of experiments.
FLOWER INDUCTION EXPERIMENTS
Preparations
Round plastic pots of 25 cm diameter and 25cm depth were filled with a mixture
of topsoil, peatmoss, vermiculite, and perlite (4:2:1:1 vol/vol). A rooted 10-20
cm Salvia stem cutting (two or three nodes) was placed in each pot. Plants were
watered as necessary. They were fertilized weekly with 1.0 l of a 2 tsp/5 gal
solution of a 15-30-15 soluble fertilizer containing trace elements (Stern's
Miracle-Gro®, with 0.05% each of Cu, Mn, and Zn as the sulfates and 0.1% Fe as a
chelate) with 1 ml of an 85% phosphoric acid solution added to counteract
basicity. This routine was used for all experiments.
Outdoor and greenhouse experiments
About 50 plants were cultivated in an Ann Arbor garden during summers. They were
put in a greenhouse (Matthaei Botanical Gardens) in September 1980 and placed on
28 in tall 6 ft by 17ft benches. Minimum greenhouse temperature was 10°C.
Maximum temperature (10-30°C) depended on outside conditions.
Experimental results
Buds were observed in late October. Flowering began on 10 Nov and continued
until early January 1981. All specimens bloomed. Similar results occurred during
1981 and 1982. In autumn 1983 another research group used artificial lighting to
extend greenhouse daylength, which caused the Salvia to abort flowers and revert
to vegetative growth.
In the green house at a northern latitude S. divinorum elongated rapidly several
feet in height shortly before flowering (Fig. 2). Although the mint was normally
nearly devoid of odor, its upper leaves and flowering stalks became strongly
aromatic as buds developed. We always observed pubescent white flowers with a
purplish to blue-violet calyx. Sometimes, just before opening, the tip of the
corolla displayed a lavender tinge, which eventually disappeared. The corolla
was usually shed within 72h after complete opening.
Plants collected on Cerro Quemado were crossed with descendants of Epling's
original specimen on 19 and 21 Nov 1980. Previous trials and other information (Emboden
1979; R. Ornduff, pers. comm. 1980) indicated that the species is probably self
incompatible. Of 14 hand-pollinated flowers (later protected by glassine
envelopes), four set seed, which was collected on 16 Dec 1980 (Fig. 3). Our
attempt to grow the seeds in a growth chamber failed when it overheated to 75°C,
drying their medium and killing them (the mature plants in the chamber died to
the soil level, but soon grew again).
Growth chamber experiments
Sherer Environmental Chambers models CEL-512-37 and CEL-34-14 were freshly
outfitted with incandescent (93W) and cool white VHO fluorescent bulbs. Eleven
plants from each of the three sources were divided between the two chambers.
Plant-top light-intensity varied from 2,800-3,300 ft-c, depending on plant
height and the chamber involved. Controls were set for maximum relative humidity
(measurements varied between 50 and 100%). Temperature was set at 22°C day (16H)
and 17°C night (8 H). Plants were grown under these conditions for 12 wk.
Beginning 24 Jan 1980, daylength was decreased from 16 to 11 h over a 4 wk
period.
Experimental results
Buds were noted on 4 Apr 1980; flowering branches were collected on 20 Apr 1980
(Valdés s.n., 22 Oct 1980, MICH). All plants flowered at a height less than 1.0
m; the flowers had a purplish calyx and white corolla. Repeating the experiments
with an abrupt change from 16 h to 11 h days indicated tapered decreases in
daylength were not necessary to induce flowering. Increasing daylength to over
12 h caused plant to revert to vegetative growth and abort flowers (Valdés s.n.,
15 June 1981, MICH). Later a malfunctioning timer switch indicated that less
than a week of 24h days induced this reversion, even if conditions were returned
to short (11h) days.
DISCUSSION AND CONCLUSION
The greenhouse and growth-chamber experiments indicated that S. divinorum is an
obligate short-day plant. Plant height is a minor factor in flower development,
as several (growth chamber) specimens were less than 0.5 m tall when they
flowered. Pollination experiments showed that the mint is probably self-sterile,
but it remains to be demonstrated that S. divinorum will set viable seed.
To test for the hallucinogenic activity of S. divinorum in human beings, we
drank the infusion of the leaves and waited for the effects to occur. Within 30
min we began to see visions, which lasted for several hours. This allowed rapid
confirmation of the mint's psychotropic activity. But more interesting from a
therapeutic standpoint are the other properties attributed to the plant;
properties that are much more difficult to assess. Are these concepts that are
translatable into our western (orthodox) healing theory, or is ska María Pastora
being used as a magical treatment (for a placebo effect)? Extended observations
in the field by an acute observer would undoubtedly be more fruitful than
immediate attempts to isolate compounds responsible for these purported
activities.
Although all recent information about the use of this mint has been gathered
from Mazatec informants, the early reports of Reko and Weitlaner indicate that
other tribe may have used it also. Reko (1945) alluded to use of the divinatory
leaves by the Cuicatecs (in the district of Cuicatlán) as well as by the
Mazatecs. Weitlaner (1952) noted that a plant called "yerba" de la Virgen was
used for divination by the Otomi people of Tulancingo in Hidalgo and suggested
it could be the same species as the "yerba" de María used by the Mazatecs.
Much botanical work remains to be done on S. divinorum, from further
investigations of its range, habitat, pollination, and distribution, to a final
unraveling of the taxonomic and genetic questions that have been raised about
the plant and its relationships within the genus.
ACKNOWLEDGEMENTS
Investigations were supported by funds granted by the College of Pharmacy, the
University of Michigan, and an NIH research grant awarded to Dr. Koreeda. Bruce
Bartholomew provided us with cuttings of S. divinorum from the University of
California Botanical Gardens, Berkeley. The people who answered our letters (pers.
com) were helpful.
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