278 MiLXWKKu I'AiriLr. 



A. verticill^ta, Whorled M. Dry ground, 1°- 2° high, smoothish; 

 steins very leafy throughout ; leaves very narrow linear or thread-shaped, in 

 whorls of 3 - 6 ; flowers greenish-white. 



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

 loithout a hm-n, i. e. none to the hood-like appendages, in which it differs from 

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



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

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



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

 l°-2° high; leaves varying from oval to lincai-, mostly opjjosite; 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, I°-3° 

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

 slender pedicels, the vmbel peduncled, hoods elevated on a short ring of fila- 

 ments above the base of the corolla. 



§ 2. Flowers in loose terniinal and solitary or corymbed umhds : 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 lanee-oblong ; flowers 1' broad, green, the 



hoods purplish. 



3. ENSLENIA. (Named for 4. ^nsZm, an Austrian traveller.) y 



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

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

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



4. VINCETOXICUM., (Name is equivalent to Poison Poviowife.) ^ 

 V. nigrum, from 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. GOUOLOBUS. (Name in Greek means angled pod.) Ours are twin- 

 ing herbs, along river-banks, chiefly S., with opposite heart-shaped potiolcd 

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

 cles between the petioles, in summer, y. 



G. Ifevis. From Virg. to Illinois S. : smooth or only sparingly hairy, tlie 

 yellowish-green flowers and the longitudinally ribbed pods smooth. 



G. obliquus. From Penn. S. : hairy, somewhat chiminy ; flowers mi- 

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

 the strap-shaped or lanceolate divisions J' long ; 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 i' long. 



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



H. oarn6sa, a well-known house-plant from India ; with rooting stems, 

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

 flowers, the upper surface of corolla clothed with minute papillas. 



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

 the appendages of the stamens.) 



S. floriblinda, from Madagascar : n fine hot-hoiise twiner, very smooth, 

 with opposite oval or oblong thiekish leaves, and lateral ninhels of very showy 

 fragrant flowers, the pure white corolla 1^' in diameter, the tube 1' long. 



