The Flora of the Cayuga Lake Basin 315 



6a. E. glandulosum Lehm., var. perplexans (Trel.) Fernald. (See Rhodora 20:34. 

 1918.) 



Sunny, moist, more or less calcareous, ledges on cliffs; rare. July. 



Fall Creek, 1870 (in C. U. Herb., collector unknown) ; n. side of Taughannock 

 Gorge, head of path to top of cliff, 1907 (Anna Allen in C. U. Herb.!) ; lake shore 

 cliffs n. of McKinneys. 



E. Que. to B. C, southw. to N. E., N. Y., Wis., N. Mex., and Calif.; rare or 

 absent on the Atlantic Coastal Plain. 



3. Oenothera L. 



a. Plants tall, 10-20 dm. high, stout; capsules linear-lanceolate or cylindrical; seeds 

 in two rows in each cell ; flowers imperfectly nocturnal. 

 b. Leaves somewhat fleshy, glabrous or finely strigose ; tips of the sepals usually 

 not quite terminal, therefore separated in the bud; body of seed 1.7-2.2 mm. 

 long, 1-1.5 mm. in diam. 

 c. Plants, including the young growth, nearly glabrous. 1. O. parviflora, 



var. angustissima 

 c. Plants more strigose, the young growth and capsules usually very hairy. 



la. O. p., var. 

 b. Leaves thinner, velvety-pubescent ; tips of the sepals usually terminal, there- 

 fore in contact in the bud; body of seed (1.2) 1.4-1.8 mm. long, 0.8 mm. in 

 diam., the integument less firm. 

 c. Stems sparingly crisp-pubescent and with some hirsute hairs, or glabrate, 

 usually reddish, scarcely angled ; capsules and young growth glabrous to 

 sparingly glandular-velvety and hispid. 

 d. Bracts falling early ; the full-grown but unripe capsules 23-25 mm. long, 

 glabrous or very sparingly glandular-velvety, tapering and almost beaked 

 at the small but dilated, 4-lobed apex, these lobes entire ; leaves lanceo- 

 late; stems commonly red. 2. O. biennis, 



var. nutans 

 d. Bracts persistent; capsules 25-33 mm. long, velvety-glandular and more 

 or less hirsute, the less beaked apex scarcely dilated, 4-lobed, the lobes 

 retuse ; leaves narrowly lanceolate ; stems green or reddish. 



2a. O. biennis, 



var. pyenocarpa 

 c. Stems more densely crisp-pubescent, often with scattered longer hairs, green, 

 rarely tinged with purple, angled ; leaves very velvety ; capsules and young 

 growth densely crisp-pubescent and subappressed-hirsute, practically non- 

 glandular ; the full-grown but unripe capsules 27-30 mm. long. 



2b. O. b., var. 

 a. Plants low, 1-6 dm. high, slender ; capsules clavate, ribbed ; seeds not in distinct 

 rows, clustered ; flowers open in sunshine. 

 b. Capsules obscurely glandular-puberulent ; leaves glabrous ; stems puberulent ; 



petals 5-10 mm. long. 3. O. perennis 



b. Capsules hirsute; leaves and stems hirsute; petals 15-25 mm. long. 



4. O. pratensis 



1. O. parviflora L., var. angustissima (Gates) Wiegand. (See Rhodora 15:46, 

 1913, and 26:3, 1924. O. angustissima Gates.) Evening Primrose. 



Sandy and gravelly shores, in calcareous soils ; frequent. July-Sept. 



Confined to the lake valley and the shores of Cayuga Lake, and extending from 

 Ithaca to Cayuga on both sides of the lake. 



N. Y., probably to W. Va., and perhaps farther westw. 



The name O. parviflora L. is here adopted for the species complex of which this 

 plant is a part, rather than the later name O. muricata L. Presumably Linnaeus had 



