


Onagraceae 261 
GG. Stigma either 2-lobed or else capitate and not lobed; leaves entire or 
not. 
J. Leaves lyrately pinnate or pinnatifid. CHYLISMA (p. 267) 
JJ. Leaves entire or denticulate. 
K. Leaves denticulate or entire, linear or wider; calyx-tube prolonged 
beyond the ovary; ovary 4-celled. SPHAEROSTIGMA (p. 267) 
KK. Leaves entire, linear; calyx-tube not prolonged beyond the ovary; 
ovary 2-celled. GAYOPHYTUM (p. 268) 
FF. Anthers not versatile. 
L. Fruit dehiscent by valves, elongated, not nut-like, many-seeded; leaves 
entire to dentate. 
M. Calyx-lobes erect; petals 2-lobed, sessile. BOISDUVALIA (p. 264) 
MM.  Calyx-lobes reflexed; petals 3-lobed or entire. 
N. Petals sessile, entire, rose or violet; leaves entire. 
GoDETIA (p. 264) 
NN. Petals clawed, 3-lobed or entire, purple or violet; leaves entire to 
dentate. CLARKIA (p. 264) 
LL. Fruit indehiscent, nut-like, |—2-seeded: stigma disk-like, entire; petals 
clawed; leaves entire. HETEROGAURA (p. 268) 
DD. Plants stemless or nearly so, the stems not over 3 cm. long. 
O. Stigma capitate, entire or rarely with 4 shallow lobes: stamens of equal 
length; petals white or yellow; pod not winged. TARAXIA (p. 266) 
OO. Stigma deeply cleft into 4 linear lobes; outer 4 stamens longer than the in- 
ner 4; petals white or rose-colored. 
P. Capsule not wing-angled; seed grooved on one side: leaves entire to pin- 
natifid. PACHYLOPHUS (p. 266) 
PP. Capsule wing-angled; seed not grooved; leaves pinnatifid. 
LAVAUXIA (p. 266) 
LUDWIGIA (Isnardia) 
Annual (ours) or perennial; stem in ours glabrous, procumbent or floating, succulent, 
rooting at the nodes. Leaves alternate or opposite (ours), mostly entire (so in ours), 
sessile or petioled (ours); leaves in ours fleshy, oval to spatulate, 12—-25 mm. long. 
Flowers axillary, sessile, greenish or yellowish or reddish (ours). Calyx-tube turbinate 
(ours) ; calyx-segments 3—5 (ours 4), persistent. Petals none or 4, inconspicuous. 
Stamens 4. Ovary 4(ours)—5-celled, very short; style almost none; stigma capitate 
or 4-lobed (ours). Capsule 4-angled (ours), septicidal (ours). Seeds many, in sev- 
eral rows. (Honor of C. G. Ludwig, a German botanist.) W. E. 
L. palustris Ell. (Water Purslane) 
EPILOBIUM WILLOW-HERB 
Annual or perennial. Leaves nearly sessile, entire or denticulate, often fascicled. 
Flowers white or rose-color or purple or yellow, racemose or paniculate. Calyx-tube not 
conspicuously prolonged beyond the ovary; calyx-limb deeply 4-lobed, campanulate or 
funnelform; lobes spreading, deciduous. Petals 4, spreading or somewhat erect. Sta- 
mens 8, 4 shorter. Stigma oblong, entire or 4-lobed. Capsule linear, 4-sided, 4-celled, 
4-valved. Seeds many, with a tuft of hair at the summit. (Gk. epi~on, lobion—a little 
pod. ) 
A. Calyx-tube not extending beyond the ovary; flowers pink, 15 mm. or more wide. 
CHAMAENERION (p. 262) 
