Vou. II.] MEADOW-BEAUTY FAMILY. 475 
3. Rhexia aristdsa Britton. Awn-petaled Meadow-Beauty. (Fig. 2553.) 
Rhexta aristosa Britton, Bull. Torr. Club, 17: 14. 
pl. 99. 1890. 
Stem square, slender, glabrous, branched 
or simple 134°-2° high. Leaves sessile, 
erect, oblong or linear-oblong, obtusish at 
each end, 9//-15’/’ long, 134’/-3/’ wide, 3- 
nerved, serrate toward the apex with ap- 
pressed subulate teeth, glabrous or very 
nearly so beneath, but with a few scattered 
hairs above; flowers 1-4 together, short- 
pedicelled, magenta-red, 1/-114’ broad; sum- 
mit of the calyx-tube and its linear lobes with 
scattered subulate hairs; petals rounded, 
but obtusely pointed and aristate at the apex; 
anthers linear, minutely spurred on the back. 
In sandy swamps, pine-barrens of New Jer- 
sey, Delaware and South Carolina. Base of the 
stem with a coating of spongy tissue when 
growing in water. July—Aug. 
wen N' 
4. Rhexia cilidsa Michx.  Ciliate Meadow- 
Beauty. (Fig. 2554.) 
Rhexia petiolata Walt. Fl. Car. 130. 1788. (?) 
Rhexia ciliosa Michx. Fl. Bor. Am. 1: 221. 1803. 
Stem square, glabrous, simple or nearly so, 1°-2° high. 
Leaves ascending, ovate, very short-petioled, or sessile, 
acutish at the apex, mostly rounded at the base, 6/’-10/’ 
long, 4/’-6’’ wide, 3-nerved, glabrous or nearly so be- 
neath, pubescent with a few scattered hairs above, the 
margins bristly-ciliate; cyme few-flowered; flowers very 
short-pedicelled, violet-purple, 1/-114’ broad; calyx gla- 
brous, or with a few hairs on its lobes; petals rounded, 
sometimes apiculate; anthers oblong, straight, not 
spurred on the back. 
In swamps, Maryland to Florida, west to Louisiana. June- 
Aug. ye 
Family 87. ONAGRACEAE Dumort. Anal. Fam. 36. 1829.* 
EVENING-PRIMROSE FAMILY. 
Annual or perennial herbs, rarely shrubs, with alternate or opposite leaves, 
no stipules or mere glands in their places, and axillary spicate or racemose gen- 
erally perfect regular or sometimes irregular flowers. Calyx-tube adnate to 
the ovary, often prolonged beyond it, the limb 2-6-lobed (usually 4-lobed). 
Petals 2-9 (usually 4), convolute in the bud, rarely none. Stamens usually as 
many or twice as many as the petals, inserted with them on the summit of the 
calyx-tube, or on the epigynous or perigynous disk. Ovary 1-6-celled (usually 
4-celled); styles united; stigma capitate, discoid or 4-lobed; ovules in each 
cavity, generally anatropous. Fruit a capsule or small nut. Seeds mostly 
small; endosperm very little or none; embryo straight. 
Forty genera and about 350 species of wide geographic distribution, most abundant in America. 
Floral whorls of 4 parts or more. 
Fruit a many-seeded capsule, opening by valves or by a pore. 
Calyx-tube not prolonged beyond the ovary. 
Seeds naked. 
Stamens 4, in I row. 
Leaves opposite; stems creeping or floating. 
Flowers sessile; petals none, or very small; leaves petioled; capsules ses- 
sile, short, the top flat. 1. Isnardia. 
Flowers long-stalked; petals conspicuous; leaves sessile; capsules elon- 
gated, curved, with a prominent 4-lobed stylopodium. 2. Ludwigiantha. 
Leaves alternate; stems erect or ascending. 3. Ludwigia. 
Stamens 8-12, in 2 rows. 4. Jussiaea, 
ed Seeds furnished with a tuft of silky hairs. 5. Chamaenerion. 
* Text revised by Dr. JoHN K. SMALL. 
