282 Karl M. Wiegand and Arthur J. Eames 



18. Apios (Boerh.) Ludwig 

 1. A. tuberosa Moench. Groundnut. 



Low thickets, in rich sandy alluvial soil ; common. Aug.-Sept. 10. 



Abundant in the Inlet Valley, along Cayuga Lake, and in the sandy soils n. of 

 the lake ; elsewhere scarce or absent. 



N. B. and N. S. to Minn., southw. to Fla., La., and Kans., including the Coastal 

 Plain. 



The genus was apparently first separated from Glycine by Ludwig in 1790, as 

 Apios. Bradleia Adans. seems to be a straight synonym of Glycine L. 



19. Amphicarpa Ell. 



a. Pubescence appressed ; leaves thin, the terminal leaflet 4-6 cm. long ; bracts 2-3 

 mm. long. I. A. monoica 



a. Pubescence spreading, hirsute ; leaves firmer, the terminal leaflet 5-8 cm. long ; 

 bracts 3-4 mm. long, more silky. 2. A. Pitcheri 



1. A. monoica (L.) Ell. Hoc Peanut. 



Low or upland thickets, in more or less sandy or gravelly soils ; common and 

 widely distributed. Aug. 



N. B. and N. S. to Man., southw. to Fla., La., and Nebr., including the Coastal 

 Plain. 



Some authors adopt the name A. comosa for this species, but the identity of the 

 Glycine comosa L. on which this was founded is not clear. The generic name 

 Amphicarpa is in the list of nomina conservanda of the International Code. 



2. A. Pitcheri T. & G. {A. monoica, in part, of Cayuga Fl.) Hog Peanut. 

 Low thickets and around marshes, in richer, more alluvial, soil than the preceding ; 



common. Aug. 



Mass. to D. C. along the coast; and from w. N. Y. to S. Dak., southw. to La. and 

 Tex. 



67. LINACEAE (Flax Family) 



Linum (Tourn.) L. 



a. Flowers blue ; capsules 10-12 mm. in diam. 1. L. usitatissimum 



a. Flowers yellow; capsules 3-6 mm. in diam. 



b. Leaves elliptic-lanceolate or linear-oblong ; false septa in capsules nearly com- 

 plete, not ciliate. 2. L. virginianum 

 b. Leaves subulate or linear ; false septa very incomplete, ciliate. 



[L. sulcatum] 



1. L. USITATISSIMUM L. COMMON FLAX. 



Along railroad tracks and roadsides, in gravelly soils ; occasionally spontaneous. 

 July. 



Frequent in railroad yards in the basin, and on garbage dumps. Native of Eu. 



2. L. virginianum L. Yellow Flax. 



Dry sandy or gravelly exposed banks, in more or less acid soils; infrequent. July- 

 Aug. 



Valley near West Danby (D.) ; near White Church (£>.) ; Newfield Glen; Coy 

 Glen (D. !) ; near South Hill Marsh; Fall Creek (D. !) ; near Newton Ponds. 



S. Me. to s. Ont, southw. to Ga. and Ky. ; occasional on the Coastal Plain. 



[L. sulcatum Riddell. 



Appeared in 1903 on Thurston Ave., Ithaca (F. W . Foxzvorthy in C. U. Herb.) ; 

 apparently temporarily adventive, and not persisting.] 



