Part 2, 1917] AMARANTHACEAE 
Sepals of the pistillate flowers with fimbriate margins. 
Sepals of the pistillate flowers with entire or crenulate 
margins. 
Utricle longer than the sepals; pistillate sepals narrowly 
obovate, obtuse or acute, l-nerved; bracts about as 
long as the sepals; glomerules of flowers much shorter 
than the petioles, 
Utricle shorter than the sepals; sepals broadly spatu- 
late, with evident lateral veins. 
Bracts half as long as the flowers or shorter; axillary 
glomerules of flowers shorter than the petioles. 
Bracts equaling or exceeding the flowérs; axillary 
glomerules mostly equaling or exceeding the 
petioles. 
Sepals of the pistillate flowers oblong to obovate, not contracted into a 
claw, or, if somewhat spatulate, not urceolate; flowers monoecious. 
Utricle dehiscent. 
Inflorescence of terminal or axillary, simple or paniculate spikes, 
pone of flowers often present also in the axils of the 
eaves. 
Spines wanting; utricle regularly circumscissile. 
Bracts longer than the flowers, or, if shorter, the sepals shorter 
than the utricle. 
Pistillate sepals rhombic-obovate to broadly spatulate, the 
edges overlapping; terminal spikes usually recurved from 
the base. 
Pistillate sepals lanceolate, elliptic, oblong, or narrowly 
spatulate, separate, or at most the edges barely 
touching; spikes erect or the uppermost recurved 
from the middle. 
Pistillate sepals usually shorter than the utricle, if 
longer acuminate or acute. 
Plants not viscid-pubescent, usually more than 3 
dm. high; petioles commonly shorter than the 
leaf-blades; bracts not indurate. 
Bracts obtuse or acutish, equaling or up to one 
and one half times as long as the sepals, usually 
red or purple. 
Bracts acute or acuminate, usually twice as long 
as the sepals, commonly green or pale- 
reddish. : 
Spikes slender; bracts 3-5 mm. long, thin. 
Spikes stout; bracts usually more than 5 mm. 
long, thick. 
Plants densely viscid-pubescent, 3 dm. high, or 
less, ascending; petioles equaling or exceeding the 
leaf-blades; bracts somewhat indurate. 
Pistillate sepals obtuse or truncate, equaling or usually 
conspicuously longer than the fruit. 
Inflorescence usually tinged with red; pistillate 
sepals 1.5—2 mm. long; plants nearly glabrous. 
Inflorescence pale-green; pistillate sepals 3 mm. long; 
plants copiously villous. 
Bracts about as long as the flowers; pistillate sepals usually 
obtuse, equaling or usually longer than the utricle. 
Spines present in the axils of the leaves; utricle irregularly or 
imperfectly dehiscent. 
Inflorescence wholly of axillary glomerules. 
Sepals in both staminate and pistillate flowers 4 or 5; seed 1.5 mm. 
in diameter; stems prostrate. 
Sepals 1-3; seed 0.6-0.8 mm. in diameter; stems erect or pros- 
trate. 
Sepals of the pistillate flowers 2 or 3, all except one reduced to 
minute scales; stems slender, prostrate. 
Sepals of the pistillate flowers 3, equal or nearly so; stems 
stout, erect or ascending. 
Plants densely viscid-pubescent; leaf-blades crispate. 
Plants not viscid-pubescent; leaf-blades not crispate. 
Utricle indehiscent. 
Utricle rugose. . 
Flowers in axillary glomerules; leaf-blades 6-25 mm. long, crispate. 
Flowers in elongate terminal or axillary spikes; leaf-blades 2-8 
em. long, plane. 
Leaf-blades linear or oblong-linear; sepals 5. 
Leaf-blades ovate or rhombic-ovate; sepals 3. 
Utricle smooth. : . . 
Seed 1 mm. in diameter or less; flowers usually partly in terminal 
spikes; leaves thin. 
Bracts with pungent tips, twice as long as the sepals; Jeaf- 
blades deeply retuse. 
17, 
18. 
19. 
20. 
21. 
22, 
103 
A. fimbriatus. 
A. Brandegei. 
A. venulosus. 
A. Pringlei. 
A. caudatus. 
A. cruentus. 
. A. hybridus. 
A. Powellii. 
. A. bracteosus. 
. Wrightii. 
. retvoflexus. 
. dubius. 
hs Pp Bm Ph 
. Spinosus. 
. A, dblitoides. 
A. californicus. 
A. pubescens. 
A. graecizans. 
. A. Crispus. 
35. A. muricatus. 
37. 
A. gracilis. 
A. acutilobus. 
