366 PENNELL: THE SPECIES OF KNEIFFIA 
Main stem-leaves lanceolate-ovate to 
ovate, glaucous th Ste 
glabrous or rarely obscurely pubes- 
cent. Petals of earlier flowers 25-30 
mm. long. 11. K. glauca. 
Petals of earlier flowers 5-15 mm. long. I 
florescence in a usually over one half 
height of plan 
Capaule oe with incurved glandless 
- Petals of earlier flowers I0O-1I5 
mm. None: Inflorescence erect from the 
12. K. Spachiana. 
Pee sparsely pubescent with gland- 
tipped hairs. Petals of earlier flowers 
5-10 mm. long. Young inflorescence 
nodding. 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 
Knetffia Spach, Hist. Veg. 4: 373. 1835. 
Type species, Oenothera glauca Michx. 
I. KNEIFFIA PRATENSIS Small 
Knetffia pratensis Small, Fl. SE. U.S. 842, 1335. 1903. ‘Type, 
Jefferson Co., Mo., Eggert, June 11, 1878, in Herb. N. Y. B. ey 
Type seen. 
Kneifia Sumstinei Jennings, Ann. Carnegie Mus. 3: 480. Ppl. 19. 
1906. “Dry upland field near Kittanning [Pennsylvania], 
D. R. Sumstine, June, 1905. Type specimens in the Pennsyl- 
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, Iowa 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. Leaves 
6-9 cm. long, acutish, densely strigose-pubescent with ascending 
hairs, in age somewhat glabrate. Bracts much exceeding the 
