ORDEK 100. ASCLEPIADACE^E. 273 



11 A. o bo vat a Ell. Tomentous ; leaves obovate, obtuse, mucronate; umbels 10-14- 

 flowered, lateral ; fls. large, yellowish-green : hood? elongated. Gravels, Ga., Fla. 



12 A. rubra L. Simple, glabrous; Ivs. ovate, long and acutely pointed, subsessile; 

 umbels panicled above, few ; flowers red-purple ; hoods acute, some longer than the 

 slender exserted horns. Barrens, N. J., and S. 2 3f. Leaves 35'. 



13 A. obtusifolia MX. Simple, smooth ; leaves oblong to oblong-ovate, subcordate, 

 obtuse-mucronate ; umbels 1 3, terminal, pedunculate, 15-25-flowered ; hoods trun- 

 cate, shorter than the sickle-shaped horn ; flowers G", red-green. M., W.. S. 3f. 



14 A. amplexieaulis MX. Simple, flexuous, glaucous; Ivs. ovate, cordate-clasp- 

 ing, obtuse, not mucronate ; ped. lateral and terminal, with GO dull-purplish flow- 

 ers ; pedicels slender ; hoods ovate, including the horns. Copses, S. 1 2f. 



15 A. tuberosa L. Butterfly-weed. Stem ascending, hairy, umbellate branched; 

 leaves sessile, alternate, lance-oblong ; umbels many, erect ; flowers bright orange- 

 red ; hoods oblong ; horns suberect. Dry fields. Hoot tuberous. Stem 2f. t 



16 A. pauper cula MX. Smooth and virgate ; leaves linear and oblong-linear, 46' 

 long ; umbels with few large yellow-red flowers at the naked summit. N. J., and S. 



1 7 A. Curassavica L. Half-shrubby and branching at base ; branches terete, leafy 

 to the top ; leaves lance-linear ; umbels with few large scarlet flowers. S. Fla. Cult. 



18 A. ciiierea Walt. Stem wiry, simple, naked above ; leaves linear-filiform, 1 3', 

 erect ; umbels terminal, several, bracteolate, 3-5-flowered ; peduncles 4 6" ; pedi- 

 cels 6 8" ; corolla ashy-purple, 3 4". Damp barrens, S. C. to Fla. 2 3f. 



1 9 A . viridula Chapm. Stem and leaves as in No. 18 ; umbels 6-12-flowered, yellow- 

 ish green, shorter than the leaves. Fla. 



20 A. Micliauxii Dcsn. Stems diffuse; leaves linear, 34', scattered; umbels 00- 

 flowered, often panicled, mostly shorter than the Ivs. ; fls. 3", fragrant. Sands, S. If. 



21 A. verticillata Ell. Simple, slender, erect; leaves linear, very narrow, generally 

 verticillate ; umbels small, many, lateral, 1' diameter, pedunculate. Swamps. 2f. 



2. ACERATES, Ell. Hoods of the crown destitute of a horn. Other- 

 wise nearly as in Asclepias. U Flowers greenish. June August. 



ACERATES jrroper. Umb. lateral ; pet. reflexed ; crown adnate to anth. . .Nos. 1 3 

 ANANTHERIX. Umbels terminal ; pet. spreading; crown free from anth.. Nos. 4, 5 



1 A. virldlflora Ell. Stout, whitish-downy ; leaves thick, oval, obtuse, petiolate, 



varying to elliptic-lanceolate, or even to orbicular (Ga., Prof. Pond) ; umbels small, 

 dense, subsessile. Sands. 2f. Leaves exceedingly variable. 



2 A. loiigifolia Ell. Rough-puberulent, simple ; leaves alternate, lance-linear to 



linear ; umbels lateral, pedunculate, densely many-flowered ; flowers small, 3", crown 

 stipitate. Prairies, W. 2 3f. Peduncles 1'. 



3 A. lamiiriiiosa Dcsn. Low, stout, hairy; leaves lanceolate; umbel 1, on the 



naked summit of the stem, dense ; crown sessile. Prairies, Wis. If. 



4 A. counivens Dcsn. Strict, half-shrubby ; leaves oval-oblong ; umbels 7-12-flwd., 



along the naked summit of the stem ; pet. 5", oval, with a short cusp ; hoods conni- 

 vent over the anthers. Barrens, Ga., Fla. 2f. Leaves 20 30". 



5 A. paniculata Desfn. St. angular; Ivs. lance-oblong, obtuse; umbels clustered 



at the leafy top, 5-9-flowered ; pet. large, half-erect, 1" ; pods glabrous, seeds with 

 long silky tufts. Ga. to 111. and Kan. (Rev. J. H. Carruth.) 



3. PODOSTIGMA, Ell. Cor. seg. 5, erect, oblong. Crown stipitate, 

 hoods without horns. Follicles 2, long, slender, smooth. 11 Low and 

 simple, with opposite leaves and supra-axillary few-flowered umbels. 



P. pubescens Ell. Wet grounds, S. A curious plant, with linear-oblong leaves and 

 3 5 umbels of yellowish-green flowers, in May, June. If. 



4. ENSLENIA, Nutt. Cor. 5-parted, segments erect ; hoods or scales 



18 



