ORDER 100. ASCLEPIADACE^E. 273 



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

 flowered, lateral ; fls. large, yellowish-greeu : hoods 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 

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



ISA. obtusifolia MX. Simple, smooth ; leaves oblong to oblong-ovate, eubcordate, 

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

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



14 A. amplexicaulis 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. Root tuberous. Stem 2f. t 



16 A. paupercula 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. 



17 A. Cnrassavica 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. 



ISA. clnerea Walt. Stem wiry, simple, naked above ; leaves linear-filiform, 1 S 7 , 

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

 cels 6 8" ; corolla ashy-purple, 34". Damp barrens, S. C. to Fla. 2 3f. 



19 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, 3 4', scattered; umbels QO- 

 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 

 vtrticillate ; 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. if Flowers greenish. June August. 



ACERATES proper. Umb. lateral ; pet. reflexed ; crown adnate to antb... .Nos. 13 

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



1 A. virtdiflora 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. longifolia 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. lanuglnosa Dcsn. Low, stout, hairy; leaves lanceolate; umbel 1, on the 



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



4 A. connivens 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 con.ni- 

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



5 A. panlculata Desfn. 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. (Ptev. J. H. Carruth.) 



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

 hoods without horns. Follicles 2, long, slender, smooth. U 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 

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



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



18 



