136 
Spring Flora of Oklahoma 
Corona-hoods each with an incurved horn within; 
leaves mostly opposite. 1. Asclepias. 
Corona-hoods prominently crested within; leaves alter¬ 
nate. 2. Asclepiodora. 
I. ASCLEPIAS L. 
Perennial, erect or decumbent herbs, with opposite, ver- 
ticillate or, rarely, alternate, entire leaves, and flowers in 
terminal or axillary umbels. Calyx 5-parted or 5-divided, 
often glandular within. Corolla deeply 5-parted, reflexed. 
Corona-column generally present. Corona of 5 concave, 
erect, or spreading hoods, each bearing within a slender or 
subulate, incurved horn, either included or exserted. Fila¬ 
ments connate into a tube. Antlers tippe’d with an indexed 
membrane, winged. Stigma nearly flat, 5-angled or 5- 
lobed. Follicles acuminate. 
Leaves ovate, oblong, ovate-lanceolate, obovate or obicu- 
lar. 
Plants glabrous, or minutely pubescent above. 
1 A. amplexicaulis. 
Plants, at least the lower surfaces of the leaves, can- 
escent or tomentose. 2. A. speciosa. 
Leaves lanceolate, oblong-lanceolate or linear. 
Hoods entire. 3. A. verticillata. 
Hoods dorsally hastate-sagittate. 4. A. galioides. 
1. Asclepias amplexicaulis J. E. Smith. Blunt-leaved Milk¬ 
weed. Stems glabrous, stout, erect or ascending, 2°-3° long. Leaves 
sessile, oblong or ovate-oblong, obtuse and mueronate at the apex, 
cordate-clasping at the base, 3'-5' long, margins wavy-crisped. Um¬ 
bels many-flowered, usually solitary on the terminal peduncle. Co¬ 
rolla segments greenish-purple, about 4" long. Hoods pink, toothed 
at the summit, shorter than the incurved horn, longer than the 
anthers. Follicles erect on the stout, decurved pedicels, downy, 
4'-6' long. 
In dry fields. May-August. Oklahoma County. 
2. Asclepias speciosa Torr. Showy Milkweed. Plant white- 
tomentose or canescent all over. Stem simple, stout, 12'-3G' high. 
