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+ + Stem or scape from a coated corm: pod many-seeded. 
16. Calochortus. Outer perianth-segments smaller: flowers few: anthers bas- 
ifixed. 
17. Hrythronium. Scape with 2 leaves: tlower solitary: anthers erect. 
** Fruit a berry: stem from a tuber-like rootstock, bearing a whorl of 3 leaves. 
18. Trillium. Flower solitary, terminal: outer perianth-segments leaf-like: 
stigmas sessile: leaves net-veined. 
C. Floral bracts green or greenish or none: stamens at the base of the distinct 
several-nerved persistent perianth-segments; anthers small, extrorse, 1-ceiled, cor- 
date or reniform: styles or sessile stigmas distinct: pod septicidal: leaves with 
transverse veinlets, 
* Inflorescence pubescent. 
19. Melanthium. Claws of the perianth-segments bearing the filaments. 
**Intlorescence glabrous. 
20. Zygadenus. Perianth-segments oblong-lanceolate to ovate, glandular toward 
the base. 
21. Schcenocaulon. Perianth-segments linear or linear-oblong, without glands 
and nearly nerveless. 
1. SMILAX L. (GREENBRIER. CAT-BRIER). 
Shrubby (rarely herbaceous) plants climbing or supported by ten- 
drils on the petioles of the net-veined simple leaves, with green or yel- 
lowish dicecious flowers in umbels or on axillary peduncles, distinet 
and deciduous perianth-segments, linear filaments inserted at the base, 
introrse apparently 1-celled anthers, mostly 3-celled ovary, thick 
spreading subsessile stigmas, and the fruit a small berry. 
* Herbaceous, not prickly: flowers carrion-scented; ovules 2 in each cell, 
1. S. herbacea L. (CARRION FLOWER). Stems climbing 9 to 45dm. high: leaves 
ovate or rounded, mostly cordate or truncate at base, abruptly acute to short-acumi- 
nate, 7 or 9-nerved, smooth; petioles 1.5 to 2.5 em. long: peduncles elongated (7 to 
24 cm. long), 20 to 40-flowered.—Common in the Atlantic States and extending into 
Texas. Var. PULVERULENTA Gray has leaves more or less soft downy beneath. 
** Stems woody and prickly: ovules solitary: glabrous throughout, 
+ Leaves ovate or roundish, mostly rounded or cordate at base, 5 to 9-nerved. 
++ Peduncles shorter than the petioles, 
2. S. rotundifolia L. (COMMON GREENBRIER. HORSE-BRIER). Stems tall, armed 
with scattered prickles as well as the round branches, more or less 4-angular: leaves 
ovate or round-ovate, often broader than long, slightly cordate, abruptly short- 
pointed (5 to 7 em. long): berries blue-black, with a bloom.—Moist thickets, 
extending into Texas from the east. Var. QUADRANGULARIS Gray has branches and 
especially branchlets 4-angular. 
++ ++ Peduncles longer than the petioles. 
3. S. glauca Walt. Round branches and somewhat 4-angular branchlets armed 
with scattered stout prickles, or naked: leaves subpersistent, ovate, rarely subcor- 
date, glancous beneath (and sometimes above), as well as the branchlets when 
young, 5em, long, abruptly mucronate, the edges smooth and naked: berries black, 
with a bloom.—Dry thickets, extending into Texas from the east. 
4. $8. bona-nox L. Branches and angular (often square) branchlets sparsely 
armed with short rigid prickles: leaves subpersistent, varying from round cordate 
and slightly contracted above the dilated base to fiddle-shaped and halberd-shaped 
or three-lobed, green and shining on both sides, cuspidate-pointed, often somewhat 
bristly ciliate or spinulose on the margins. (8. famnoides of Gray’s Man., probably 
not L.)—Abundant along the Rio Grande and Pecos, 
