278 MILKWKKD FAMILY. 



A. verticillata, WHORLED M. Dry ground, l-2 high, smoothish ; 

 stems very leafy throughout ; leaves very narrow linear or thread-shaped, hi 

 whorls of 3 - 6 ; flowers greenish-white. 



2. ACERATES, GREEN MILKWEED. (Name from the Greek, means 

 icithoiit (i horn, \. e. none to the hood-like appendages, in which it differs from 

 Asclepias.) Flowers green or greenish, in summer. 2/ 



1. Flowers in compact lateral umbels: corolla with oblong reflixed divisions : 

 the hoods erect : pods slendrr, sonut lines downy, but with the surface even. 



A. Viridiflbra. Dry sandy or gravelly soil : soft-downy or smootlnsh, 

 l-2 high; leaves varying from oval to linear, mostly opposite; globular 

 umbels nearly sessile ; flowers short-pediccllcd, nearly ' long when open ; 

 hoods not elevated above the base of the corolla. 



A. lorigifblia. Low barrens W. & S. : rather hairy or roughish, l-3 

 high, with very numerous mostly alternate linear leaves, flowers smaller and on 

 slender pedicels, the umbel pcduncled, hoods elevated on a short ring of fila- 

 ments above the base of the corolla. 



2. Flowers in loose terminal and solitary or corymbed umbels : divisions of the 

 corolla bare- 1/ spreading, but the large hoods spreading and slippf-r-sliuped : 

 pods thick, often with some soft tubercle-like, projections. 



A. paniculata. Dry prairies and barrens from 111. S. & W. : smoothish, 

 1 high ; leaves alternate, oblong or lance-oblong; flowers 1' broad, green, the 

 hoods purplish. 



3. ENSLENTA. (Named for A. Enslen, an Austrian traveller.) % 



E. albida. River-banks from Ohio S. & W. : climbing, 8 -12 ; smooth, 

 with opposite heart-ovate long-petioled leaves, and small whitish flowers in 

 raceme-like clusters on axillary peduncles, all late summer. 



4. VINCETOXICUM. (Name is equivalent to Poison Perncmkle.) ^ 

 V. nigrum, from Eu. : a low-twining smooth weed, escaping from garden* 



E. ; leaves ovate and lance-ovate ; flowers small, brown-purple, rather few in 

 axillary umbels, in summer. 



6. GONOLOBUS. (Name in Greek means angled pod.) Ours are twin- 

 ing herbs, along river-banks, chiefly IS., with opposite heart-shaped petioled 

 leaves, and corymbs or umbels of dark or dull-colored small flowers, on pedun- 

 cles between the petioles, in summer. If. 



G. ISBVIS. From Virg. to Illinois S. : smooth or only sparingly hairy, the 

 yellowish-green flowers and the longitudinally ribbed pods smooth. 



G. obliquus. From Penn. 8. : hairy, somewhat clammy ; flowers mi- 

 nutely downy outside, long and narrow in the bud, dull crimson-purple within, 

 the strap-shaped or lanceolate divisions ' lon^ ; pods ribless, warty. 



G. hirstltUS. From Virginia S. : differs from the last in its short-ovate 

 flower-buds, the oval or oblong divisions of corolla only about j' long. 



6. HOYA, WAX-PLANT. (Named for T. //<>,/, an English florist.) 



H. carnbsa, a well-known house-plant from India ; with rooting stems, 

 thick and fleshy oval leaves, umbels of numerous flesh-colored or almost white 

 flowers, the upper surface of corolla clothed with minute papilla 1 . 



7. STEPHANOTIS. (Name from Greek for crown and car, referring to 

 the appendages of the stamens.) 



S. floriblinda, from Madagascar : a fine hot-house twiner, very smooth, 

 with opposite oval or oblong thickish leaves, and lateral umbels of very showy 

 fragrant flowers, the pure white corolla l 



