House: NortH AMERICAN CONVOLVULACEAE 147 
The treatment of the genus Sty/isma Raf. by various Ameri- 
can authors has been the successive adoption of Sty/isma, Bonamia 
and Sreweria, as the generic name of these plants. Dr. Gray 
first used Sty/isma, and later took up Bonamia and Lreweria suc- 
cessively. The first edition of Chapman’s Flora places the spe- 
cies under Sz¢y/isma, but in the latter editions Breweria is adopted. 
All of these changes seem to be due to the fact that the Austra- 
lian genus described by Brown has about the same character of 
style and ovary. A most important fact however seems to have 
been overlooked by those who have joined the American species 
of Stylisma to Breweria, and that is that the genus Breweria pos- 
sesses a totally different habit and has comparatively stout, firm 
stems and branches, thick, firm or leathery obtuse or rounded 
sepals, points which serve to sharply separate the species of S¢y/- 
isma from Breweria. As has been shown by Hallier,* the genus 
Breweria R. Br. is congeneric with Bonamia Thouars. 
3. STYLISMA Raf. Neogenyt. 2. 1825.—Fl. Tellur. 4: 55. 
1836 
Perennial, slender, weak, prostrate or somewhat twining plants, 
herbaceous above. Leaf-blades narrow or broad, entire, not cor- 
date. Flowers 1-3, on axillary peduncles. Calyx pubescent or 
glabrous. Sepals equal or nearly so, herbaceous, pointed, some- 
what united at the base. Corolla white, rotate or subfunnelform, 
the limb plaited, 5-angled or 5-lobed. Filaments filiform. Ovary 
2-celled, 4-ovuled. Style divided nearly to the base, the divisions 
nearly equal. Stigmas 2, capitate. Capsules thin-walled, 2- 
celled, 2~4-valved. Seeds 2-4, glabrous or minutely pubescent. 
Type species: Stylisima peduncularis Raf .= Convolvulus hu- 
mistratus Walt. = Stylisma humistrata Chapm. 
Six species in the southeastern United States and one in 
northern Mexico. 
Key to the North American species 
Sepals glabrous or merely ciliate. 
Leaf-blades narrowly linear. 
Leaf-blades oblong. 
Sepals distinctly pubescent. 
Filaments pubescent. 
Foliage sparingly pubescent ; mature peduncles 1-3 cm, 
long; corolla 1.5 cm. long 
1. S. angustifolia. 
2. S. humistrata. 
3. S. trichosanthes. 
oa Bot. Jahrb. 16: 527, 573. 1893. _ Bull. Herb. Boiss. 5: 804. 1897. 
