NYCTAGINACEJ. (FOUR-O'CLOCK FAMILY.) 373 
Stamens 3, exserted. Style slender: stigma capitate. Achenium enclosed in 
the indurated ribbed persistent base of the calyx. — Erect herbs, from thick 
perennial roots. Leaves opposite. Flowers terminal, purple or rose-color. 
1. O. angustifolius, Sweet. Stem smoothish, branching above ; leaves 
linear-lanceolate, smooth, obtuse at the sessile base; the upper ones distant, 
acute; flowers loosely panicled; involucre with rounded hairy lobes, at length 
enlarged and strongly nerved, 3-flowered; base of'the calyx villous. — South 
Carolina, and westward. — Stem 3° -4° high. Leaves 2/ long. Calyx 4'/—5" 
long, whitish, veiny. 
2. O. albidus, Sweet. Stem erect, 4-angled, furrowed, glandular, pubes- 
cent; branches opposite; leaves oblong-lanceolate, roughish ; peduncles oppo- 
site, the lower ones solitary, the upper clustered; involucre hairy; base of the 
calyx 5- 6-angled, almost hispid. (Allionia albida, Ell.) — Near Columbia, 
S. C., Elliott. 
2. BOERHAAVIA, L. 
Flowers perfect. Involucre none. Calyx-tube cylindrical or obconical, 5- 
ribbed; the limb colored, funnel-shaped, 5-lobed, deciduous. Stamens 1-4: 
anthers minute, roundish. Style slender: stigma obtuse. Embryo folded. — 
Annual herbs, with diffuse branching stems, and opposite ovate or a 
leaves. Flowers small, in solitary or panicled clusters. 
Ll RH erecta, L. Stems ascending, branched from the base, amooth, tumíd 
at the joints; branches alternate ; leaves ovate or roundish, acute or mucronate, 
often more or less cordate, wavy along the margins, whitened and minutely dot- 
ted with black beneath; clusters 3 — 5-flowered, in ample panicles; stamens 2; 
fruit smooth, obconical, truncate, strongly ribbed. — Cultivated ground, Florida 
to South Carolina. July -Sept.— Stem 19-39 long. Leaves rather thick, 
2'—3'long. Flowers small, purple. 
2. B. hirsuta, Willd. Stem diffuse, alternately branched, minutely pubes- 
cent, hirsute above ; leaves ovate or oblong-ovate, mucronate, obtuse at the base, 
undulate, smooth, and similarly colored on both sides, ciliate on the margins; 
clusters 3 - 6-flowered, forming a loose spreading panicle ; flowers minute ; calyx- 
limb hairy at the apex ; fruit obconical, rounded at the apex, with the ribs gland- 
ular-viscid. — South Florida. — Stem stout, 2°-3° long. Leaves 1'-2' long. 
3. B. viscosa, Lag. Viscid or minutely pubescent; stem terete, straight ; 
branches opposite ; leaves ovate-oblong or ovate-lanceolate, mucronate, acute at 
the base, smooth, whitish beneath, slender-petioled ; peduncles solitary, axillary, 
2cleft, mostly shorter than the leaves; flowers capitate, minute; stamens 3; 
fruit club-shaped, acutish, with the ribs glandular. — South Florida. — Stem 2? - 
3° long. Leaves 1'- 14 long. 
3. PISONIA, Pm. 
. Flowers dicecious. Involucre none. Calyx 5- or 10-toothed, Mese c 
= sterile n" tabular and aerosol pear aen: 
5 82 ; 
