ASCLEPIADACEAE 1069 
"XI. VERTICILLATAE 
Hoods nearly equalling the a the much exserted 
sle n horns converging over its top: column about 
ong. 
UD y ee redominantly opposite; blades flat. 20. A. linearis. 
Upper leaves predominantly whorled in 3's to 6's; blades 
revolute. 21. A. verticillata. 
Hoods much exceeding the androecium, the horns not much 
exserted, flattened : column scarcely 0.5 mm. long. 
Umbels usually several in the upper leaf-axils : hoods 
erect or nearly so. 2. A. viridula. 
Umbels usually terminal and solitary: hoods somewhat 
; 23. A. Michauzii. 
ae CINEREA 
Slender-stemmed plant with few pa of leaves and few- . 
flowered umbels: corolla-lobes tardily reflexed. 24. A. cinerea. 
. A. decumbens L. Stem decumbent or procumbent, 3-6 dm. long, hirsute 
or hispid: leaf- B5 s mainly elliptic to lanceolate with more or less hastate 
base, 3-19 em. delia cutish: corolla-lobes 
j—7 mm. long: horn a ce above nee hood- 
uricles, included o a near the base: fol- 
licles mostly over 10 em. re es holds, 
Ill 
Y., probably also further north. Sun 
Corolla orange or nearly so. 
2. A. tuberosa L. Stem mostly erect or 
ascending, 3-6 dm d mun leaf-blades 
usually laneeolate, varying to pd Ud 
elliptic to Ld lanceolate, 3—9 long, 
acute: corolla-lo i. m. lon NA aris- 
ing opposite MERC EE about 14 
ineluded: follieles a less than m 
ong pr eS iced EURISY s ) 
nes fields, various provinces, Fla. to 
; Minn., Ont., and Me.—Sum.-fall E unn bright-orange or yellow. 
ii Britton. Stem erect or ascending, 1-3 dm. tall, hirsute: leaf- 
blades eris broadly or narrowly pandurate, 3-7 em. long, truncate or eordate 
at the base: corolla-lobes elliptic, 6-7 mm. long: horn arising below oL hood- 
auricles, very 2s about 1% included: follicles 9-14 em. ong.—Pi nds, 
Coastal Plain, Fla. to S. C.—Spr.-sum. or all year S.—Corolla A MA 
PY lanceolata Walt. Stem 4—11 dm. tall, eae or nearly so: leaves few, 
“distant; blades elongate- ee linear-lanceolat e, or narrowly ieee mostly 
1-2.5 dm. long, tapering to the base: corolla- lobes elliptic, 8-0 mm. long, ea 
hoods ovate, less than twice as long as the androecium m, orange-red, rounded at 
the apex: horn narrowly lanceolate, much cee than the hood: follicles 7-10 
em. long.—In acid swamps, Coastal Plain, Fla. to Tex. and N. J.—Sum 
A. aL. Stem 3-12 dm. tall, o e blades ovate, ovate-lanceo- 
D Or ede lanceolate i em. lon olla- des pet red or rarely 
purplish-green n, 7-8 lon ods NM abou g, orang 
timged, about twi S igs as the androecium: horn “tender subulate, nearl 
as long as the hood: follicles 9— . long.—Acid swamps and a rounds 
e 11 em 
Coastal Plain and rarely inland provinces, Fla. to Tex., W. Va. 
. laurifolia Michx. Stem 8-11 dm. tall, od glabrous: leaf-blades 
ceolate to linear-lanceolate, m 1-3 dm . lon rolla- lobes reddish- Sue. 
—10.5 mm. long: hoods 44.5 m m. long, a pen exeeeding the androe- 
