260 Onagraceae 
by the membranous calyx, 4-celled, septicidal. (Diminutive of L. rota—a wheel; refer- 
ring to the whorled leaves of some species.) . (Ammannia humilis.) 
R, ramosior Koehne 
LYTHRUM ‘ LOOSE-STRIFE 
Annual (ours), or perennial. Leaves opposite or alternate or whorled (not ours), 
entire. Flowers solitary or cymose-paniculate or spicate, terminal or axillary (ours). 
Calyx-tube cylindric, 8—12-ribbed, straight; calyx-teeth 46, and | in each notch be- 
sides. Petals 4—6, rarely none (not ours). Stamens 8—12, on the calyx. Capsule 
oblong, membranous, 2-celled, 2-valved or bursting irregularly. Seeds many, flat or an- 
gular. (Gk. lythron—blood; perhaps on account of styptic properties.) W. (L. ad- 
surgens. ) L. hyssopifolia L. 
ONAGRACEAE Evening-primrose Family 
Herbs (ours) or rarely shrubs, annual or biennial or perennial. Leaves simple, 
alternate or opposite; stipules none or mere glands. Flowers basal or axillary or spicate 
or racemose, perfect, regular or irregular. Calyx-tube adherent to the ovary, often pro- 
longed beyond it; calyx-limb 2—6-lobed but usually 4-lobed. Petals O—9 (ours O or 
2 or 4), on top of calyx-tube. Stamens usually as many or twice as many as the sepals, 
on top of calyx-tube. Ovary inferior, |—6-celled; style 1; stigma capitate or 4-lobed; 
cells 1- to many-ovuled. Fruit a capsule or nutlet. Seed mostly small. 
A. Leaves opposite, not all basal. 
B. Calyx-segments 2, petals 2, stamens 2; capsule obovate, leaves ovate to cor- 
date. CIRCAEA (p. 269) 
BB. Calyx-segments 4, petals 4, stamens 4 or 8; capsule mostly not obovate; leaves 
in most species narrow. 2 
C. Stems procumbent or floating; leaves entire; stamens 4; capsules about 3 mm. 
long; calyx-segments persistent on the capsule; seeds not hairy. 
LupwiciA (p. 261) 
CC. Stems neither procumbent not floating, erect to decument or caespitose; leaves 
often not entire; stamens 8; capsule 10 mm. or more long; calyx-segments de- 
ciduous from the capsule; seed long-hairy at one end. FEPILOBIUM (p. 261) 
AA. Leaves alternate or all basal. 
D. Plants with evident stems. 
FE. Lower leaves often opposite; stamens 8; seed with a tuft of long hair at one 
end. EPILOBIUM (p. 261) 
EE. Leaves all alternate; stamens 4 or 8; seed without a tuft of hair at one end. 
F.  Anthers versatile. 
G. Stigma plainly 4-lobed or -cleft; leaves not entire. 
Flowers axillary, white, becoming rose-colored in age; some species 
with pinnatifid leaves; capsule not nut-like, elongated, many-seeded; seeds 
in | row in each cell of the pod. ANoGRA (p. 266) 
HH. Flowers in terminal spikes, yelllow or rose-colored; no species with 
pinnatifid leaves. 
I. Petals yellow, sometimes becoming pink in age, obcordate; capsule 
elongated, not nut-like, many-seeded; seeds in two rows in each cell. 
Onacra (p. 265) 
II. Petals rose-colored, spatulate; capsule oblong, nut-like, |—4- 
seeded. GAURA (p. 268) 

