324 TAMACEAE 
10. E. rotatum a rs Leaves usually 2 or 3; blades 2 nearly flat, 
glaucous: scape 2.5-3.5 dm. pe. arg 1 -edged, very glaucous: flowers 
usually 2 together, ent wn 4— wide, truneate at the peo of the 
filaments, with 2 or perd ie Tatera] "teeth o n the truneate parts: 
eapsule subglobose, slightly lobed, 2.5-3 em. wide. —Flat woods, N Fla.—Sp: 
ll. H. Palmeri S. Wats. Leaves 4 dm. long or her : os narrowly linea 
5-10 mm. wide, channe roe angled on the back: scape 1-4 dm. tall, dame 
ea qM the edges rounded: flower erect, faintly fragrant hypan onn 
e 6-8 cm. long, ye ellowi sh-green, nearly terete: sepals narrowly line 
E ead involute- S petals similar bo p sepals, but sli ighüy nm 
edi about 5 em. wide, the limb white, flaring from a short greenish base, 
longer and narrow teeth on each side: filaments white, about 2.5 em. long. 
humilis S. Wats.]— (ArLIGATOR-LILY.)—Prairies and Everglades, Pet Fla.—Spr. 
Famy 2. TAMACEAE— Yam Fairy 
Perennial vines with rootstocks. Leaf-blades ribbed and netted- 
veined. wers monoecious or dioecious, or rarely perfect. Calyx of 
3 sepals. Corolla of 3 petals eras the sepals. Androecium of 3-6 
stamens, atest in pistillate flowers. Gynoecium of 3 united carpels, 
imperfect in staminate flowers. Dn inferior. Styles 3. Ovules 1 or 2 
in each cavity of the ovary. Fruit a 3-winged, diis RSS or 
baecate.—AÀbout 10 genera and 175 nd mostly Ameri 
1. DIOSCOREA [Plum.] L. Upper leaves alternate: blades mainly c 
date. Sepals and petals mainly green or whitish.—About 160 species, xis 
abundant in tropical regions.—Early sum.—WiLD YAM-ROOTS. YAM-VIN ES 
Staminate panicles solitary in s Rime, 
Lower leaves whorled in 4’s— 
€ ades green Beneat th: eames sepals 1.5 mm. long 
ess. 1. D. quaternata. 
Leaf-blades glaucous beneath: staminate sepals over 1.5 
2. D. glauca. 
Lower js typically alternate. 
Pistillate racemes many-flowered, many-fruited at matu- 
rity: stem internodes glabrous. 3. D. villosa. 
Pistillate racemes few-flowered, 1-4- fruited at maturity: 
stem internodes pubescen 4. D. hirticaulis. 
Staminate panicles clustered in ie PIE or sometimes indi- 
vidually solitary, and terminating the stem 9. D. floridana. 
D. quaternata ( Walt.) Gmel. dead k slender, mostly 1 cm. thick or 
less, sometimes :: rked, often with few short lateral MARE lower petioles 
dens e po at the base and the 
and glabrous: staminate sepals n 
or oval: Bd te gc f ian red: 
fruit obov 1.5-3 lon ~~ Woods 
and banks, a Plain and: eg. prov- 
inces, Fla. to La., Mo., and S Va. 
2. D. glauca. Muhl.  Root-stoek es 
undulate, glaucous and usually finely 
