UKDEK 100. ASCLEPlADACEyE. 273 



11 A. obovata Ell. Tomentous ; leaves obovate, obtuse, mucronate ; umbels 10-14 

 flowered, lateral ; fls. large, yellowish-greeu : 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 3 5'. 



13 A. obtusllolia MX. Simple, smooth ; leave? oblong to oblong-ovate, subcordate, 

 obtuse-mucronate ; nmbels 13, terminal, pedunculate, 15-25-flowered ; hoods trun- 

 cate, shorter than the sickle-shaped horn ; flowers 6", red-green. M., W., S. 3f. 



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

 ing, obtuse, not mucronate ; ped. lateral and terminal, with OO 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. Root tuberous. Stem 2f. t 



16 A. paupercnla MX. Smooth and virgate ; leaves linear and oblong-linear, 4 6' 

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



1 7 A. Curassavlca 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. clnerea Walt. Stem wiry, simple, naked above ; leaves liuear-flliform, 1 y, 

 erect; umbels terminal, several, bracteolate, 3-5-flowered ; peduncles 46"; pedi- 

 cels 68" ; corolla ashy-purple, 34". Damp barrens, S. C. to Fla. 2 3f. 



1 9 A . vir i lu la Chapm. Stem and leaves aa in No. 18 ; nmbels 6-12-flowered, yellow- 

 it-h green, shorter than the leaves. Fla. 



20 A. micbauxil Dcsn. Stems diffuse; leaves linear, 3 4', scattered; umbels GO- 

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



21 A. vertlcillata 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. y Flowers greenish. June August. 



ACEKATES jrroper. Umb. lateral ; pet. reflexed ; crown adnate to anth. . .Nos. 1 8 

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



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



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

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



2 A. longifolla 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. laniiginosa Dcsn. Low, stout, hairy; leaves lanceolate; umbel 1, on the 



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



4 A. coiinkvens Dcsn. Strict, half-shrubby ; leaves oval-oblong ; nmbels 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. panlculata Desfh. St. angular; Ivs. lance-oblong, obtuse; umbels clustered 



at the leafy top, 5-9-flowered ; pet. large, half-erect, 7" ; 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. 1C Low and 

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



P. pubesceiis 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 



