366 PENNELL: THE SPECIES OF KNEIFFIA 
Main stem-leaves lanceolate-ovate to 
ovate, glaucous’ beneath. Stems 
glabrous or rarely obscurely pubes- 
cent. Petals of earlier flowers 25-30 
m. long. 11. K. glauca. 
Petals of earlier flowers 5-15 mm. long. In- 
florescence in fruit usually over one half 
height of plant. 
Capsule pubescent with incurved glandless 
hairs. Petals of earlier flowers 10-15 
. long. Inflorescence erect from the 
first. 12. K. Spachiana. 
Capsule sparsely pubescent with gland- 
tipped hairs. Petals of earlier flowers 
5-10 mm. long. Young inflorescence 
odding. 13. K. perennis. : 
Stem-leaves filiform-linear to filiform. Bracts del- 
toid-ovate to ovate, shorter than the capsules. 
Stigmas very short, scarcely appearing as lobes. 
Wings of capsule ridge-like. PENIOPHYLLUM. 
KNEIFFIA Spach 
Kneiffia Spach, Hist. Veg. 4: 373. 1835. 
Type species, Oenothera glauca Michx. 
1. KNEIFFIA PRATENSIS Small 
Kneiffia pratensis Small, Fl. SE. U.S. 842, 1335- 1903. “Type 
Jefferson Co., Mo., Eggert, June 11, 1878, in Herb. N. Y. B. G. 
Type seen. . 
Kneifia Sumstinei Jennings, Ann. Carnegie Mus. 3: 480. pl. es 
1906. ‘Dry upland field near Kittanning [Pennsylvania], 
D. R. Sumstine, June, 1905. Type specimens in the Penney 
vania Herbarium of the Carnegie Museum. Acc. No. 2905: 
Isotype seen in the herbarium of the New York Botanical 
Garden. 
Oenothera pratensis Robinson, Rhodora 10: 34. 1908. 
Prairies and woods, Ohio to Wisconsin, lowa and Arkansas; 
introduced near New York City, Pittsburgh and Washington. 
2. Kneiffia sessilis Pennell, sp. nov. 
Stem 3-4 dm. tall, pubescent with ascending hairs. 
6-9 cm. long, acutish, densely strigose-pubescent with di ‘the 
hairs, in age somewhat glabrate. Bracts much excee ing 
Leaves | 
