278 MILKWEED FAMILY. 



A. verticillita, Whoeled M. Dry ground, 1°- 2° high, smoothish; 

 stems very leafy throughout ; leayes very narrow linear or thread-shaped, in 

 whorls of 3 - 6 ; flowers greenish-white. 



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

 without a horn, i. e. none to the hood-hke appendages, in which it differs from 

 Asclepias.) Flowers green or greenish, in summer, y. 



§ I. Flowers in •compact lateral umbels: corolla loith oblong rejlexed divisions: 

 the hoods erect : pods slender, sometimes downy, but with the surface even. 



A. viridiflora. Dry sandy or gravelly soil : soft-downy or smoothish, 

 1° - 2° high ; leaves varying from oval to linear, mostly opposite ; globular 

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

 hoods not elevated above the base of the corolla. 



A. longifolia. 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 peduncled, hoods elevated on a short ring of fila- 

 ments above the base of the corolla. 



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

 corolla barely spreading, but the large hoods spreading and slipper-shaped : 

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



A. panicul&ta. 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. ENSLENIA. (Named for 4. i^nsfen, an Austrian traveller.) y. 



E. &lbida. Eiver-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. {Sa.meiseqmr&le.nt to Poison Periwinkle.) % 

 v. nigrum, fi'om Eu. : a low-twining smooth weed, escaping from gardens 



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

 axillary umbels, in summer. 



5. GONOLOBITS. (Name in Greek means angled pod.) Ours are twin- 

 ing herbs, along river-banks, chiefly S., 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, y. 



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

 yellowish-green flowers and the longitudinally ribbed pods smooth. 



G. Obllquus. From Penn. S. : hairy, somewhat clammy ; flowers mi- 

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

 the strap-shaped or lanceolate divisions J' long ; pods ribless, warty. 



G. birsiltUS. From Virginia S. : differs from the last in its shortovate 

 flower-buds, the oval or oblong divisions of corolla only about 4' long. 



6. HOYA, WAX-PLANT. (Named for T. Hoy, an English florist.) 



H. earndsa, 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 coroUa clothed with minute papilla. 



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

 the appendages of the stamens. ) 



S. floribTinda, 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 coroUa I^' in diameter, the tube I' long 



