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A. ANDROSAEMIFOLIUM L, may occur within our range, and may be recognized by 
its divergently forking branches, ovate distinctly petioled leaves, loose spreading 
cymes, and pale rose-colored corolla with revolute lobes. 
3. MACROSIPHONIA Muell. (Arg.) 
Erect shrubby plants, with numerous opposite or verticillate leaves, 
comparatively large showy flowers which are either terminal or become 
lateral, 5-parted calyx many-glandular at base within, salverform corolla 
with long tube and enlarged throat, short filaments in the throat with 
oblong or sagittate anthers obtusely tipped and with obtuse basal 
appendages, thick 5-ribbed stigma with entire or 2-cleft small apex and 
base appendaged with 5 reflexed lobes or a 5-cleft membrane, and long 
and slender terete pods with numerous oblong seeds tufted at apex. 
1. M. Berlandieri Gray. Shrubby, white-tomentose: leaves from oval or cordate- 
ovate to orbicular, becoming greenish and merely pubescent above, the diverging 
veins at length conspicuous: corolla merely puberulent outside, its slender tube 
(with throat) 7.5 to 12.5 cm. long, many times exceeding the calyx and the round- 
obovate (nearly 2.5 em. long) lobes.—Rocky soil, western Texas, 
2. M. Wrightii Gray. Slender, soft-puberulent: leaves narrowly lanceolate, 
acute, white-tomentulose beneath, glabrous or nearly so above: tube of corolla and 
throat each 12 mm. or more long, tomentulose, the lobes 12 mm. long.—Mountains 
beyond the Limpia. 
4. TRACHELOSPERMUM Lemaire. 
Twining more or less woody plants, with opposite leaves, small flow- 
ers in cymes, 5-parted calyx with 3 to 5 glands at base inside, funnel- 
form corolla with 5-lobed limb, 5 included stamens, slender filaments, 
sagittate anthers with an inflexed tip, and 2 slender pods with numer- 
ous oblong tufted seeds. 
1. T. difforme Gray. Nearly herbaceous and glabrous: leaves oval-lanceolate, 
pointed, thin: calyx-lobes taper-pointed: corolla pale yellow. (Forsteronia difformis 
A. DC.)—River banks, extending from the Gulf States into Texas. 
ASCLEPIADEX. (MILKWEED FAMILY.) 
Plants with milky juice, opposite or whorled (rarely alternate or seat- 
tered) entire leaves, follicular pods, seeds, anthers (connected with 
stigma) just asin last family from which they differ in the commonly 
valvate corolla, in the singular connection of anthers with stigma, and 
the cohesion of the pollen into wax-like or granular masses (pollinia) 
as explained under the typical genus Asclepias. 
* Anthers tipped with an inflexed or sometimes erect scarious membrane, the cells 
lower than the top of the stigma; pollinia suspended. 
+ Crown double: stems twining. 
1. Philibertia. Corolla rotate: exterior crown a membranaceous ring adnate to 
base of corolla; interior of 5 scales adnate to base of the short stamen-tube or col- 
umn. 
+ + Crown single. 
++ Stems erect or merely decumbent. 
2. Asclepiodora. Corolla rotate, merely spreading: crown of 5 hooded fleshy 
bodies, with a salient crest in each: leaves alternate, 
