266 Onagraceae 
ANOGRA WHITE EVENING PRIMROSE 
Annual or perennial; stems present, often with papery bark, somewhat woody. 
Leaves alternate, sometimes pinnatifid. Flowers diurnal, axillary, white, becoming rose- 
color in age, nodding in bud. Calyx-tube prolonged above the ovary, deciduous; calyx- 
segments 4, narrow. Stamens 8, -unequal; anthers versatile. Ovary slender; stigma 
deeply 4-cleft. Capsule elongated, spreading or ascending, loculicidal. Seeds many; in 
| row in each cell. (An anagram of Onagra.) 
A. Calyx villous or densely strigose; at least some of the leaves deeply pinnatifid. E. 
A. trichocalyx Small 
AA. Calyx glabrate or sparsely hairy; leaves entire to merely short-lobed. 
B. Leaves glabrous; capsules divaricate, usually some of them contorted or twisted. E. 
A. pallida Brit. 
BB. Leaves pubescent beneath; capsules ascending, straight. E. 
A. nuttallii Nels. 
PACHYLOPHUS STEMLESS EVENING PRIMROSE 
Herbs. Perennial; stems none or very short. Leaves entire to pinnatifid. Flowers 
large, white or rose-colored, opening only at night or in cloudy weather. Calyx-tube 
elongated, somewhat dilated at the throat; calyx-limb 4-parted, erect in the bud. Petals 
4, sessile, white, but changing to red in age. Stamens 8, unequal; anthers basifixed. 
Capsule ovate or ovate-oblong, large and rigid, sharply or obtusely 4-angled, mostly ses- 
sile. Seeds in | or 2 rows, large, with a deep groove along one. side. (Gk. pachys= 
thick, lophia—a crest; referring to the warty edges of the capsule. ) 
A. Plant wholly glabrous thruout; petals 2—4 cm. long. E. (P. nuittallii.) 
P. caespitosus Raim. 
AA. Plant more or less pubescent or hairy; petals 4—6 cm. long. 
B. Leaves green, glabrous except for the villous margin. E. 
‘ P, marginatus Rydb. 
BB. Leaves canescent-puberulent on both sides. E. 
P, canescens Pip. 
LAVAUXIA 
Perennial or annual, low, stems none or rarely present. Leaves mostly basal, pin- 
natifid, many, 7.5—30 cm. long (ours), petioled (ours). Flowers perfect, white or pink 
or yellow (not ours), 2.5—-6 cm. wide (ours). Calyx-tube slender, 5—10 cm. long 
(ours), dilated at the throat; calyx-segments 4, finely reflexed. Petals 4, spreading, in 
ours often 3-lobed. Stamens 8, 4 longer; anthers versatile. Ovary short, 4-angled; 
stigma 4-cleft. Capsule stout; in ours ovoid, with 4 wing-angles, 1.2—2.5 cm. long. 
Seeds few, not grooved. (Honor of F. Delavaux, the founder of a French botanical 
garden.) E. L. trilobata Spach (3-lobed Primrose) 
TARAXIA 
Annual or perennial; stemless. Leaves entire to pinnatifiid. Flowers white or 
yellow, axillary. Calyx-limb 4-parted; calyx-tube filiform, longer than the ovary, mar- 
cescent or tardily deciduous. Petals 4, deciduous. Stamens 8, erect; anthers basifixed 
or versatile. Style usually adherent to the calyx-tube; stigma capitate, entire or 4-toothed. 
Capsule sessile. Seeds in 2 rows in each cell. (Gk. taraxis—trouble or confusion; 
apparently a puzzling genus.) 
