ASCLEPIADACEAE 951 
4. Metastelma barbigerum Scheele. Stems glabrous, slender, filiform above : leaf- 
blades oblong or oblong-lanceolate, sometimes a few of them ovate-lanceolate, 2.5-5 cm. 
long, acuminate and cuspidate, rounded at the base, thinnish, glabrous except for a few 
hairs on the midvein beneath and with a few glands above at the base of the blade, rarely 
thicker and a little coriaceous : cymes 1—5-flowered : calyx-lobes ovate-lanceolate, 1-5 mm. 
long, obtuse: corolla 4-5 mm. long, campanulate, dull greenish white ; lobes elongated, 
linear-lanceolate, acute, the tips slightly revolute, densely and retrorsely white-bearded to 
below the middle within : crown-lobes slender, linear-subulate, attached to the showy very 
short column and appearing as if wing-angled towards its base, considerably exceeding the 
anthers: anther-wings short, angled or rounded at the salient base: pollinia pear-shaped, 
tapering upward to the broadish angled caudicle: the corpuscle obovate-oblong, obtuse at 
the apex: follicles 4-5 cm. long, slender-fusiform, acuminate : seeds 6 mm. long, pale 
brown : coma 2.5 cm. long. 
In open woods and on rocky banks, Texas and New Mexico. 
5. Metastelma Bahaménse Griseb. Stems nearly glabrous, sometimes minutely 
pubescent in lines: leaf-blades 1.5-2.5 cm. long: blades round-oval to oblong, mucronate- 
cuspidate ; petioles slender, 5-7 mm. long: cymes 3-6-flowered, the pedicels 2-3 mm. 
long, very slender, unequal : corolla white, open-campanulate, fleshy ; lobes obtuse, slightly 
spreading, densely white-tomentose within : crown adnate to the whole of the high slender 
column ; lobes linear-faleate, obtuse, not exceeding the anthers, wing-angled, internally 
carinate: stigma flat or slightly depressed, obscurely 5-angled: follicles 5-6.5 cm. long, 
fusiform, very slender, long-acuminate, glabrous, thickish, striate, dark purplish : seeds 5 
mm. long, dark brown, slender, thin, with one or two rows of elevated tubercles along 
the margin : coma about 2 cm. long. 
In sand, usually in open woods, Florida Keys. 
9. ROULINIELLA Vail. 
Twining shrubby plants. Leaves opposite: blades cordate at the base, long-petioled. 
Inflorescence cymose or somewhat paniculate or racemiform. Calyx small, glandulose. 
Corolla rotate, with oblong, dextrorsely convolute lobes. Crown 5-lobed, attached at the 
base of the corolla-tube and the gynostegium : lobes broad, often fleshy or leathery, the lat- 
eral margins involute. Stigma flat and depressed, obscurely 5-rayed and 2-lobed. Follicles 
thick, acute, smooth. Seeds comose. [Roulinia Decne., not Brongn. ] 
1. Rouliniella unifaria (Scheele) Vail. A slender climbing and twining vine. Stems 
pale gray-green when fresh, striate, glabrous or minutely pubescent in lines on the upper 
portion and somewhat sulcate : leaf-blades 3-7 cm. long, ovate, hastately cordate, gradually 
acuminate, glabrous, thin, the auriculate basal lobes rounded, with an open sinus and a few 
glands at the base of the blade above: calyx-lobes lanceolate-oblong, 4 mm. long, with a 
gland in each sinus: corolla 4-6 mm. long, white; lobes 3 mm. long, linear-oblong, 2.5 
mm. wide, broadly obtuse or nearly truncate, thin, 3-veined, the revolute margins with 
two thickened callous ridges at the revolute apex within: crown adnate to the base of the 
column, 5-lobed to near the base; lobes erect, obtuse, not exceeding the anthers, 3-lobed, 
the middle lobe slightly the longest: anther-wings small; anther-tips semi-orbicular, in- 
flexed on the scarcely conic stigma: pollinia elliptical-ovoid, the caudicles broad at the 
attachment, orange-red on the upper margin, the corpuscle acute at the apex : follicles 6 
em. long, ovate, acuminate with an obtuse apex, coriaceous, glabrous: seeds 5 mm. long: 
coma 1 cm. long. 
In thickets, southern Texas and New Mexico. Spring to fall. 
10. GONÓLOBUS Michx. 
Perennial twining herbaceous vines. Leaves opposite, cordate, thin. Flowers in 
axillary peduncled cymes. Calyx-lobes 5, glandular within, lanceolate. Corolla white, 
campanulate : lobes 5, slightly contorted, nearly erect. Crown nearly sessile, of 5 mem- 
branous, erect truncate lobes, each appendaged by 2 terminal awns. Stamens inserted at 
the base of the corolla: filaments united into a short tube : anthers terminated by an erect 
or slightly inflexed membrane. Anther-wings corneous, salient at the base after the man- 
ner of Asclepias. Pollinia oblong-elliptical on rather broad caudicles, pendulous. Stigma 
conic, slightly 2-lobed.  Follicles thick, strongly and sharply angled. Seeds comose. 
1l. Gonolobus laévis Michx. Stems high-climbing, slender, glabrous or minutely 
pubescent in lines: leaves 4-15 cm. long; blades ovate, gradually acuminate at the apex, 
