erly by the California Botanical Society, Inc., and is Society, Herbarium, Life Sciences Building, University iblished 1916. Second-class postage paid at Berkeley XEW OF DRYPETES () FROM PANAMA \itor — BARBARA D. WEBSTER :nt of Agronomy and Range Science GRADY L. WEBSTER :rsity of California, Davis 95616 Department of Botany, University of California, Davis 95616 ate Editor — GRADY L. WEBSTER otany, University of California, Davis 95616 Drvpetes, which with about 200 species is one of the larger genera of Euphorbiaceae (Airy Shaw, 1966), is best represented in the Old World tropics; only about 20 valid species have been recognized from neotropi- cal America. The is rather isolated in the Euphorbiaceae (Webster, ERSON, Duke University, Durham, North Carolina 1967): together with the satellite (and scarcely distinct) genera Neo- ersity of California, Santa Barbara ivawrea and , it is referable to the tribe Drypeteae, which has Dlaremont Graduate School Jniversity of California, Davis no very close neighbors in subfamily Phyllanthoideae (Webster, 1975). :alifornia State University, Hayward The species of Dry petes are rather poorly understood, partly because the niversity of California, Irvine erratic flowering, dioecious flower distribution, and nondescript foliage iversity of California, Berkeley make recognition of imperfect specimens difficult. liversity of Calif ornia, Hastings Reservation lern Oregon College, Ashland The elusiveness of Drypetes is indicated by the fact that the species University of Wyoming, Laramie here described, a tree 15-2 5 m high, was overlooked by many botanists California State University, Los Angeles on Barro Colorado Island—one of the best-explored localities in the iversity of California, Davis tropics—until 1971, when it was collected by Dr. Thomas Croat and Dr. rnia State University, Los Angeles Robin Foster. Recently I have examined two sheets of what appears to be the same species from southern Venezuela; these collections were annotated by Dr. Paul C. Standley with a manuscript name. Since both NIA BOTANICAL SOCIETY, INC. of the Venezuelan specimens are pistillate, and it is not absolutely certain OFFICERS FOR 1977 that they are conspecific with the Panamanian , it seems best to BRIOGS, Carnegie Institution of Washington, describe the species from the Panama specimens and to commemorate Dr. Standley's association with the by dedicating the specific epi- TA DAY, Department of Botany, California Academy of thet to him. i, San Francisco, California 94118 Drypetes standleyi Webster, sp. nov. sect. Drypetitis, ad D. vari- OB KTJIJT, Department of Biological Sciences, abilem Uitt. accedens sed foliis chartaceis abrupte acuminatis, staminibus ^ethbridge, Alberta, Canada 8 vel 9 minoribus, pedicellis 9 brevioribus; a D. amazonica Steyerm. IARLES F. QTJIBELL, Department of Biological Sciences, differt antheris glabriusculis, foliis chartaceis integris. inert Park, California 94928 Tree c. 15-25 m high; trunk c. 0.25-1.25 m diam., buttressed at base: t. RUDOLF SCHMID, Department of Botany, erkeley, California 94720 twigs terete, minutely hispidulous when young (trichomes 0.1 mm long BARBE, California Department of Food and Agriculture, or less), glabrate and pale in age and prominently lenticellate. Leaves , California 95814 chartaceous: petioles glabrous or nearly so, flattened adaxially, mostly 5-10 mm long: stipules scarious, very inconspicuous (less than 1 mm nia Botanical Society consists of the officers listed above '.sident, DENNIS R. PARNELL, Department of Biological long): blades nearly glabrous (slightly strigose on midrib beneath), ellip- iversity, Hayward, CA 94542; the Editors of Madrono; tic to broadly lanceolate, rather abruptly short-acuminate at tip, asym- mbers: L. R. HECKARD, Jepson Herbarium, Department metrically cuneate at base, mostly 7-11 cm long, 2.5-6 cm broad, plumb- ilifornia, Berkeley, CA 94720 (1975-1977) ; JAMES R. eous and somewhat lucent on both sides: midrib salient beneath, main on, Star Route 80, Carmel Valley, CA 93924 (1976- epartment of Ecology and Systematic Biology, Califor- lateral veins 7-9 on a side, distinctly raised beneath, brochidodromous. .ncisco, CA 94132 (1977-1979). veinlets forming a prominulous reticulum; margins*€ntire. Staminate Madrono, Vol. 24, Xo. 2, pp. 65-128. April 21, 1977. 66 MADROXO 1977] WEBSTER: DRYPE ADDITIONAL COLLECTIONS. PANAMA. Canal Zo Of Armour Trail, Croat 14843 (DAV, MO) ; S of I6il6 (DAV, MO) ; S of Zetek 11, Foster 1122 \pure: Las Piedras, alrededor de Puerto Paez, /. V and determination somewhat uncertain). Bolivar: Caura. L. Williams 11986 (YEN).

Drvpetes standleyi clearly belongs in s c\dia auct.) because of its small stipules, st tillode. and unilocular ovary (Pax & Hoffm In the treatments of neotropical Drypetes jablonsky (1967), the plants from Barro Cc South American species D. amazonica Ste; while in the revision by Pax and Hoffmann to the West Indian species D. dussii Kr. & first, it appeared that the Panamanian plant: D. i-ariabilis, but they clearly differ in the thi a number of reproductive characters: smalle FIG. 1. Flowers of Drypetes standleyi. A, pistillate flower {Foster Croat mostly 8 (occasionally 8 in D. variabilis, but 2307). B. staminate flower (Croat 14849). pedicels, densely tomentose ovary, and wrin between D. standleyi and its near congeners following key: flowers in axillary clusters subtended by scarious bracteoles; pedicels Stamens 4, anthers only 0.5 mm long, glabrou 7-11 mm long, densely hispidulous; sepals 4, recurved, oblong-spathu- acuminate; Guiana late, marginally ciliate, appressed-hirsutulous on the back, glabrous or Stamens 4-12, anthers larger (or else pubescc nearly so within, c. 2.5-3 mm long, 1.7-2.2 mm broad; disk somewhat Stamens mostly 4-7; leaves entire or nearl; fleshy, 1-1.5 mm across, glabrous; stamens 8 (rarely 9), filaments 1-2 Staminate flowers several per axil; sep; mm long; anthers linear-oblong, glabrous (sometimes obscurely and anthers less than 1 mm long, pubesc very sparsely pubescent), (1.0-) 1.2-1.6 mm long: pistillode absent. mm long: drupes 0.8-1.3 cm long, < Pistillate flowers axillary, 1-4 per cluster; pedicels stout (0.6-1 mm taceous; West Indies thick), straight, densely hispidulous, 2-6 mm long; sepals 4, deciduous, Staminate flowers 1-3 per axil; pistillal broadly obovate, minutely strigose on the back, glabrous within, mar- broad; anthers over 1 mm long, < ginally ciliate, 2.8-4.4 mm long, 2.5-3.2 mm broad; disk strigillose- 15-21 mm long; drupes 2-2.5 cm ciliate, 2.0-2.3 mm across; ovary globose or ellipsoidal, c. 2 mm across, coriaceous; northern South America densely whitish-tomentose, 1-locular; stigma sessile or nearly so, reni- Stamens mostly 8-12 (rarely 7). form, glabrous, c. 1.7-2.5 mm across. Fruits somewhat compressed, Drupes 2.5—3 cm long; staminate sepal: strongly reticulate-wrinkled, appressed-hirsutulous, scarcely beaked, 2- glabrous except for marginal ciliae; ; 2.2 cm long, 1.3-1.5 cm across; endocarp lignified, c. 1.5 mm thick with a pronounced obtuse ventral carina within; ovule attached apically by an i Drupes less than 2.5 cm long; staminati elliptical scar, mature seeds not observed. pubescent on the back. TYPE: Panama, Canal Zone, Barro Colorado Island, E of Armour Anthers glabrous (or very nearly so), Trail, 31 May 1971, R. Foster & T. B. Croat 2307 (pistillate; holotype, chartaceous, entire; Panama and DAV; isotypes DUKE, MO, and to be distributed). Paratype (stamin- *. ate flowers): Barro Colorado Island, Armour Trail, 31 May 1971, T. B. Anthers distinctly pubescent, 2.0-2.4 m Croat 14849 (DAV, MO) (Fig. 1). entire to crenate; Brazil . . . . MADRONO WEBSTER: DRYPETES 67 1977] ^L COLLECTIONS. PANAMA. Canal Zone: Barro Colorado I., 300 m E F Armour Trail, Croat 14843 (DAY, MO) ; S of big trees on Armour Trail, Croat {,-16 (DAY. MO); S of Zetek 11, Foster 1122 (DAY, DUKE). VENEZUELA. . K- Las Piedras, alrededor de Puerto Paez, J. Velez 2635 (YEN; fruits immature , Determination somewhat uncertain). Bolivar: en los rebalsos de Guayape, Bajo Sura. L. Williams 11986 (YEN).

Drvpitcs standleyi clearly belongs in sect. Drypetes (sect. Hemi- cyclia auct.) because of its small stipules, staminate flowers without pis- tillode, and unilocular ovary (Pax & Hoffmann, 1922; Webster, 1967). In the treatments of neotropical Drypetes by Monachino (1948) and Tablonsky (1967), the plants from Barro Colorado would key out to the South American species D. amazonica Steyrm. or D. variabilis Uitt., while in the revision by Pax and Hoffmann (1922) they would be close to the West Indian species D. dussii Kr. & Urb. or D. glauca Vahl. At first, it appeared that the Panamanian plants could be accommodated in D. variabilis, but they clearly differ in the thinner less rigid leaves and in a number of reproductive characters: smaller staminate sepals, stamens 'andleyi. A, pistillate flower (Foster & CroaM mostly 8 (occasionally 8 in D. variabilis, but usually 7), shorter fruiting <4849). pedicels, densely tomentose ovary, and wrinkled fruits. The differences between D. standleyi and its near congeners may be summarized in the following key: blended by scarious bracteoles; pediceM Stamens 4, anthers only 0.5 mm long, glabrous; leaves crenate, cuspidate- ilous; sepals 4, recurved, oblong-spathul acuminate; Guiana D. fanshawei Sandw. sed-hirsutulous on the back, glabrous orl Stamens 4—12, anthers larger (or else pubescent). long, 1.7-2.2 mm broad; disk somewhat! Stamens mostly 4-7; leaves entire or nearly so. )us; stamens 8 (rarely 9), filaments 1-2H Staminate flowers several per axil; sepals less than 1 mm broad: ^g> glabrous (sometimes obscurely andl anthers less than 1 mm long, pubescent; fruiting pedicels 5-12 '-) 1.2-1.6 mm long; pistillode absent. I mm long: drupes 0.8-1.3 cm long, oblique at tip: leaves char- per cluster; pedicels stout (0.6-1 mm 1 taceous; West Indies D.albaPoit. ilous, 2-6 mm long; sepals 4, deciduousl Staminate flowers 1-3 per axil: pistillate sepals more than 1 mm ?ose on the back, glabrous within, mar-1 broad; anthers over 1 mm long, glabrous: fruiting pedicels ig, 2.5-3.2 mm broad; disk strigillose-1 15-21 mm long; drupes 2-2.5 cm long, symmetrical; leaves y globose or ellipsoidal, c. 2 mm across,! coriaceous; northern South America . . . D. variabilis Uitt. cular; stigma sessile or nearly so, reni-1 Stamens mostly 8-12 (rarely 7). i across. Fruits somewhat compressed, I Drupes 2.5-3 cm long; staminate sepals at least 3.5-4 mm long, oressed-hirsutulous, scarcely beaked, 2- glabrous except for marginal ciliae: anthers slightly pubescent: :ndocarp lignified, c. 1.5 mm thick with a Martinique D. dussii Kr. & Urb. a within; ovule attached apically by an I Drupes less than 2.5 cm long; staminate sepals 2.5-3.5 mm long, observed. pubescent on the back. Barro Colorado Island, E of Armour Anthers glabrous (or very nearly so), 1.2-1.6 mm long; leaves : T. B. Croat 2307 (pistillate; holotype, j chartaceous, entire; Panama and Venezuela 3 to be distributed). Paratype (stamin- D. stanoHeyi Webster ind. Armour Trail, 31 May 1971 T B Anthers distinctly pubescent, 2.0—2.4 mm long; leaves coriaceous, 1). entire to crenate: Brazil . . D. amazonica Stevrm.