ASCLEPIADACEAE | 1067 
. floridana (Lam.) A. Hitche. Plant 2-7 dm. tall, finely cinereous: lea 
blades narrowly linear, often elongate, to rarely narrowly linear aa 
umbels usually slender- edunded: pedicels strigillose: calyx-lobes triangular- 
ovate: corolla-lobes about 5 ong, 
es eyes 2 crown E 2.5 
meter: Tolli cles 9-11 cm. long: 
seed 10- ilm m. long. [A. longifolia EN.]— 
mp o En and prairies, Pe Plain, 
a rarely adj. provinces, es xX., Ark., 
and Del.—Spr.-sum. or all y year vg 
2. A. delticola Small. Plant similar to A. 
floridana in habit: leaf-blades ie 
umbels rather slender-peduncled: pedicels 
sparingly strigillose: calyx-lobes deltoid- 
d 2 lobes m ica in A. flori- 
about 3.5 in : diameter: 
Follicles pn seen.—Low 3 mde. New Or- 
leans, La.—Spr.-sum. 
3. A.hirtella Pennell. Plant 6—10 dm. tall, densely cinereous: leaf-blades nar- 
rowly linear-lanceolate to linear, often numerous and elongate: umbels stout- 
peduneled: pedicels Dus us calyx-lobes ovate- n eorolla-lobes fully 
twice the length 2 the calyx- tes: crown db Sd pun half the length 
of the androecium: follicles 9-10 mm. long: seeds abou . long.—Prairies 
and roadsides, various provinces, Ala. to Okla., Il., a Mich, — Sum. 
4, A. viridiflora (Raf.) pee. Now 2-6 dm. tall: leaf- ud Ra to 
ovate, elliptic, or oval, 4—12 c ng: calyx x-lobes lance s a-lobes 5—6 
mm. long: hoods 3—4 mm. iuc n ane -wings about 4 m m. long: o llicles $—12 
em. long: d 7-8 mm. long. — d. sterile soil, various provinces, Fla. to Tex., 
N. Mex., Sask., and Mass.—Spr.-su : 
6. ASCLEPIAS [Tourn.] L. Erect or spreading herbs, with narrow or 
broad leaf-blades. Calyx-lobes 5. Corolla rotate: lobes eres: Hoods of the 
crown trowel-like or scoop-like, erect or spreading, not adnate to the anther- 
' the base. Follicles ovoid or fusiform.—About 95 species, mostly American.— 
Sum.—MILKWEEDS. SILKWEEDS. 
Crown longer than the T GERE or slightly shorter; hoods rounded, obtuse, or 
truncate at the a 
Corolla prientcolored: "ares white: crown white, maroon, or bright-colored, not 
Follicles erect on deflexed pedicels. 
ollicle - uper glabrous or pubescent 
Lea mostly oe not opposite: plant 
copiously pubescent. I. _TUBEROSAE. 
Leaves mostly oca or whorled. 
orolla orange-scarlet, red, or purple. ~ -IL — ^ 
. Corolla white or greenish- red. 
jmbel xe dr on an elongate terminal 
D ncle, an pee EA oe 
meti nt: hoods m III. AMPLEXICAULES. 
Umbels usually Se eal ee ‘and 
minal: hoods pale. l 
Stem prostrate: leaves vertical; 
ie sessile and cordate- clasp- 
IV. HUMISTRATAE. 
iem erect: leaves not vertical; 
ae ides p petioled and tapering at 
Y. IXALTATAE. 
