Vol. III.] 



MILKWEED FAMILY 



3. Acerates Floridana (Lam.) Hitchc. 



Florida Milkweed. (Fig. 2926.) 

 Asclepias Floridana Lam. Encycl. 1: 284. 1783. 

 Acerates longifolia Ell. Bot. S. C. & Ga. i: 317. 



l8l 7- 

 Acerates Floridana A. S. Hitclic. Trans. St. 



Louis Acad. 5: 508. 1891. 



Rough-puberulent; stems slender, simple or 

 little branched, erect or ascending, i-3 high. 

 Leaves linear or rarely linear-lanceolate,- acute 

 or acuminate, short-petioled, 2 / -S / long, 1 y 2 "- 

 6" wide, commonly rough-ciliolate on the mar- 

 gins and midrib; umbels several or solitary, 

 peduncled, usually many-flowered; peduncles 

 y/_T 5 '/ long; pedicels slender, hirsute, %'-\' 

 long; corolla greenish white, its segments nar- 

 rowly oblong, about i ,f long; column short but 

 distinct; hoods oblong, obtuse, entire, shorter 

 than the anthers; anther-wings narrowed to the 

 base; follicles densely puberulent, 4 / -5 / long. 



In moist soil, Ohio to southern Ontario and Min- 

 nesota, south to North Carolina, Florida and Texas. 

 June-Sept. 



4. Acerates auriculata Engelm. 



Auricled Milkweed. (Fig. 2927.) 



Acerates auriculata Engelm. Bot. Mex. Bound. 



Surv. 160. 1859. 

 Asclepias auriculata Holzinger, Bot. Gaz. 17: 



125. 1892. 



Stem glabrous, often glaucous, sinuous 

 above, rarely branched below, usually stout, 

 i-3 high. Leaves narrowly linear, gla- 

 brous, short-petioled, 3 / -8 / long, ^ // -2^ // 

 wide, becoming leathery, the rough mar- 

 gins not re volute; umbels commonly several, 

 densely many-flowered, peduncled; pedun- 

 cels 2 // -l / long, pubescent; pedicels slender, 

 pubescent; flowers greenish white tinged with 

 dull purple; corolla-segments oblong, 1"- 

 2 J^" long; column short, but distinct; hoods 

 yellow, often with a purplish keel, entire, or 

 emarginately truncate at the apex, not ex- 

 ceeding the anthers, the involute margins 

 spreading at the base into broad auricles; 

 follicles 2 / -3 / long, curved. 



In dry soil, Nebraska and Colorado to Texas 

 and New Mexico. June-Sept. 



5. Acerates lanuginosa (Nutt.) Dec. 



Woolly Milkweed. (Fig. 2928.) 



Asclepias lanuginosa Nutt. Gen. 1: 168. 1818. 

 Acerates lanuginosa Dec. in DC. Prodr. 8: 523. 1844. 



Hirsute all over; stems erect, slender, simple, 

 6 / -i8 / high. Leaves oblong, ovate-lanceolate 

 or lanceolate, obtuse at the apex, narrowed or 

 rounded at the base, short-petioled, i / -4 / long, 

 4 // -i5 // wide; umbel solitary, terminal, densely 

 many-flowered, peduncled; peduncle stout, 

 densely hirsute, Yz'-iYz' long; pedicels slender, 

 puberulent or hirsute; corolla greenish, its seg- 

 ments oblong, about 2^" long; column none; 

 hoods purplish, oblong, obtuse, entire, with a flat 

 fold or auricle on the infolded lower ventral 

 margins, shorter than the anthers; anther-wings 

 broadest below the middle. 



On prairies, northern Illinois to Minnesota and 

 Wyoming. June-Aug. 



