MILKWEKI) FAMILY. 289 



mlnal and solitary or corymbed umbels ; pods lhi('k, often with some soft 

 tubercle-liko projections/ Prairies, 111. to 'I'ex. and S. ('. 



3. ACERATES, GREEN MILKWEED. (Xanie from the Greek, 

 means without a horn, i.e. none to the hood-like appendages, in which 

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

 A. viridifl6ra, Ell. Dry sandy or gravelly soil ; soft-downy or smooth- 



i.sh, \°-l^ liis^h ; leaves varying from oval to linear, mostly opposite ; 

 globular uml)els nearly sessile; flowers short-pediceled, nearly \' long 

 when open ; hoods not elevated above the base of the corolla. 



A. longifdlia, Ell. Low barrens Ohio, W. and 8.; rather hairy or 

 roughish, l'^-3° high, with very numerous, mostly alternate, linear leaves ; 

 flowers smaller and on slender pedicels, the umbel peduncled ; hoods ele- 

 vated on a short ring of filaments above the base of the corolla. 



4. ENSLENIA. (Named for A. Enslen, an Austrian traveler.) 2Z 

 E. albida, Nutt. 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. River banks, renii., S. and W. 



5. VINCETOXICUM. (LiiVin: bindirifj, poison.) H 



V. nigrum, Moench. A low-twining, smooth weed from Eu., escaping 

 from gardi'ii.s !<:.; leaves ovate and lance-ovate; flowers small, brown- 

 purple, rather tew in axillary umbels, in summer. 



6. CYNANCHUM. (Greek, meaning c7oi/i>o/son.) 



C. acuminatifd/ium, Heni.sley (or Vincetoxicum acumin.Vtt.m). Mos- 

 (jLiTO Pr>.\xT, so called, because small insects are stuck fast in the clefts 

 of the crown ; flowers white and pretty, in axillary clusters ; leaves 

 lanceolate or ovate-lanceolate and acuminate ; 2'^-8°, with a twining 

 tendency. Japan. H 



7. GONOLOBUS. (Greek: angled pod.) Ours are twining herbs, 

 along river banks, with opposite, heart-shaped, petioled leaves, and 

 corymbs or umbels of dark or dull-colored small flowers, on peduncles 

 between the petioles. The following are the commonest. 21 



G. l^vis, Miohx. Smooth or only sparingly hairy, the yellowish-green 

 flowers and the longitudinally ribbed pods smooth. Va., S. and W. 



G. obliquus, R. Hr. Hairy, somewhat clammy ; flowers minutely 

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

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

 Penn., S. and \V. 



G. hirstitus, Michx. Differs from the last in its short-ovate flower 

 buds, the oval or oblong divisions of corolla only about j' long. Va., S. 

 and W. 



8. HOYA. WAX PLANT. ( 7'Aoi»rt.s- //o//, an English gardener.) "U 

 //. corndso, R. Br. Well-knownhou.se 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?. 



9. STEPHANOTIS. (Greek: cruvn and ear, referring to the appen- 

 dages of the stamens.) 2/ 



S.floribunda, Brong. ]\lAnAf;.\s(Ait J.\smixi:. A fine hothouse twiner, 

 very smooth, with opposite, oval or oblong, thickish leaves, and lateral 

 gray's k. v. \- <;. noT. — 10 



