164 CONTRIBUTIONS FROM U, 8S. NATIONAL HERBARIUM. 
DESCRIPTIONS OF SPECIES. 
ANALYTIC KEY, 
Spikes in clusters of 3 to 5 at the ends of the branchlets. 
Petiolar glands fully developed........22....--.--2222----- 1. S. pleiostachys. 
Petiolar glands none or rudimentary. .............02..-2--- 2. S. anadenum, 
Spikes single on each branchlet. 
Leaves distinctly lanceolate. 
Capsules sessile. .......2.22.22-2-----------2-2---200-- 8. So mexicanum, 
Capsules pedicellate. 
Apical glands well developed....2..........-- eeeee 4. 8, thelocarpuin. 
Apical glands none............2.22222222-2-------- DS. pedicellatum, 
Leaves short and rather broad. 
Petiolar glands distinctly on margin of blade....222 2... 6. NS. pittiers, 
Petiolar glands on petioles. 
Spikes thick and rather short .......22222222....-- 7. S. pachystachys. 
Spikes rather long and slender. 
Leaves sinall, oval-elliptic, acumen reflexed.... 8. S. oligoneurimn., 
Leaves medium, broadly ovate, acumen unguli- 
form ...2.2-----------222-------- 2222 eee YO. suleijerum. 
1. Sapium pleiostachys Schumann « Pittier, sp. nov. Puate X. Fiaure 7. 
A medium-sized or even large tree, with ascending limbs and elongated crown; 
young shoots reddish, short; leaves more or less coriaceous and thick according to 
age; petioles rather thick, 1.5 to 3 em, long; petiolar glands short and obtuse; leaf 
blades 6 to 15 em. long, 8 to 5.5 em. broad, obovate 
or oval-elliptic, cuneate or slightly rounded at base, 
acuminate but with rounded, flat tip; margins 
smooth at blooming time, distinctly sinuate on fruc- 
tiferous twigs; secondary nerves rather close, areu- 
ate, very salient on lower face; stipules small, 
a b C scarious, ovate-acuminate; floral spikes androgy- 
Fig, 7.—Sapium pletostachys. a, Pistil- nous, 7 to 9em. long, in terminal clusters of 3 to 5; 
late flower; b,bract; ¢, stuninate  pachis and other parts of inflorescence purplish- 
flower. “J: . . ae 
tinged; floral glands paired, diseoid; pistillate 
flowers 6 to 8 at base of spikes, their involucral bracts broadly obovate, the calyx 
bottle-shaped, inclosing the whole of ovary and style; ovary subsessile or very shortly 
stipitate, ovate-elongated; style rather long, persistent, stigmas well-developed, spiral; 
staminate flowers 6 to 8 in each cluster, the calyx of the open flowers elongated at base 
in a pedicel-like tube; filaments short; anthers rather small, half-inclosed, deep 
purple; anthesis successive, beginning at center of cluster; capsules sessile, smooth, 
7to8 mm. high, 8 to 9 mm. in diameter; seeds lenticular, black, obscurely verrucose, 
4 to 5 mm. in diameter and 3.8 to 6 mm. thick, with a slender caruncula at the apex. 
Costa Rica: Forests of Golfito de Osa, close to seashore, H. Pittier, March, 1896, 
flowers (Inst. fis.-geog., Costa Rica, no. 9906; U.S. National Herbarium, no. 578902, 
type). Guatemala: San Felipe, Departamento Retalbuleu, altitude 700 meters, fruit, 
April, 1892 (John Donnell Smith, no. 2607). 
2. Sapium anadenum Pittier, sp. nov. Puate XI, Fieurr 8. 
A tree 15 to 20 meters high, with horizontal limbs and rounded crown; petioles 
slender, 1.5 to 8 cm. long; petiolar glands mostly absent or rudimentary; leaf blades 
oval-elliptic or lanceolate, rounded at base, narrowing into a slightly incurved tip, 
chartaceous, shiny on both faces, 4 to 9 em. long, 2.5 to 4em. broad, obscurely sinu- 
