Part 2, 1917] AMARANTHACEAE 
Leaf-blades elliptic or oblong-elliptic, 14-21 em. long; branches 
fruticose nearly throughout. 
Spikelets 3-5 mm. in diameter. 
Bracts and bractlets rounded or obtuse at the apex. 
Inflorescence naked; bracts stramineous or whitish; pubes- 
cence of the sepals bright-white; leaf-blades broadest at 
the middle. 
Inflorescence leafy; bracts fuscous; pubescence of the sepals 
brownish; leaf-blades broadest near the base. 
Bracts and bractlets acute or acuminate, cuspidate. 
serps minute; sepals acute or acutish; bracts sparsely 
villous. 
Staminodia one third as long as the filaments; sepals obtuse 
or rounded at the apex; bracts densely villous. 
Branches of the inflorescence densely canescent or tomentose. 
Outer sepals hyaline or at least very thin, glabrate or lanate. 
Leaf-blades elliptic to oblanceolate-oblong, 12-20 em. long, soon 
glabrate; spikelets sessile; sepals sparsely lanate at the base. 
Leaf-blades ovate to lanceolate, 8 em. long or less, permanently 
pubescent; spikelets mostly pediceled; sepals densely lanate. 
Outer A subcoriaceous, thick and rigid, pilose below with straight 
airs. 
Hairs im the base of thé flowers more than twice as long as the 
sepals. 
Hairs at the base of the flowers scarcely exceeding the sepals. 
Sepals 1.5-1.7 mm. long or less; spikelets sessile or pedunculate, 
3-4 mm. thick; leaf-blades abruptly acuminate or long- 
acuminate. 
Spikelets mostly sessile, less than 3 mm. thick; leaf-blades 
11-18 cm. long, 4-7 cm. wide. 
Spikelets mostly pedunculate, 4 mm. thick; leaf-blades 
3.5-7 cm. long, 2-3 cm. wide. 
Sepals 2-2.5 mm. long; spikelets mostly pedunculate, 5~6 mm. 
in diameter; leat-blades acute, acuminate, or abruptly 
acute. 
Leaf-blades rounded at the base, broadest at or below the 
middle, subcoriaceous. 
ro aaa acute at the base, broadest above the middle, 
obaly 
Flowers dioecious. 
Stems conspicuously fruticose nearly throughout, sometimes scandent. 
Branches of the inflorescence glabrous or nearly so. 
Bracts subcoriaceous, rounded at the apex; lateral veins of the 
leaves nearly obsolete. 
Bracts scarious, mucronulate; jateral veins of the leaves coarse 
and prominent. 
Branches of the inflorescence densely canescent, tomentose, or 
strigose. 
Staminate spikelets glomerate at the ends of fruticose branches; 
leaf-blades about as broad as long, usually suborbicular. 
Staminate spikelets paniculate; leaf-blades much longer than 
broad. 
Sepals of the pistillate flowers rigid, green, the tips slightly 
spreading. ~ ; 
Sepals of the pistillate flowers thin, whitish, the tips erect or 
incurved. 
Pubescence of branched hairs. 
Pubescence of simple hairs. 
Panicles on long naked peduncles, narrow, the branches 
usually short. 
Leaves soon glabrate; pubescence of the stems 
lustrous. 
Leaves permanently pubescent, at least beneath; 
pubescence dull. . 
Panicles short-pedunculate or usually sessile, broad, 
the branches usually elongate. 
Leaves white beneath with a usually dense tomen- 
tum. . 
Spikelets usually sessile, short; leaf-blades thick, 
subrugose; branches of the panicle stout. 
Spikelets nearly all pedunculate, elongate; leaf- 
blades thin; branches of the panicle slender, 
flexuous. 
Leaves not white beneath, the pubescence of yel- 
lowish, straight or loosely matted hairs. 
Panicles very dense; bracts and sepals villous 
only at the base; sepals of the staminate 
flowers 2.5-3 mm. long. 
10. 
11. 
12, 
13. 
14, 
15. 
16. 
17. 
18. 
19, 
20. 
21. 
22. 
23. 
155 
. arbuscula, 
. nigra, 
. pacifica. 
. angustifolia. 
arenaria. 
I. tomentella. 
ss 
. Harimanii. 
. completa. 
. costaricensis. 
. domingensis. 
. argentata. 
. Wrightii. 
. Palmeri. 
. interrupta. 
. rotundifolia. 
. Pringlei. 
. Siricta. 
. nitens. 
. Schaffneri. 
. cassiniaeformis. 
discolor. 
. grandis. 
