1906] Brainerd, — Hybridism in the Genus Viola 53 



different dates in ^Nlay, and were to me a puzzle until I saw last Sep- 

 tember a fine plant in the garden at Bronx Park. This was com- 

 pletely sterile; though there were fifty or more eleistogamous fruits, 

 not a seed could be found. Its relationship to V. cucuUata is evident, 

 as Mr. Bicknell observes; its somewhat short and beardless spurred 

 petal and elongated peduncles indicate this. The color of the petals, 

 "pale lilac to lavender blue," is a modification in the direction of V. 

 emarginata. The contour of the leaf and its slight pubescence is just 

 such a compromise as might be expected from the union of V. cucul- 

 lata with a modified form of V. emarginnia like that described below 

 (no. 29, B). Further study another season of the living plant may 

 lead to more certain conclusions. 



17. V. EMARGINATA X SEPTE.MLOBA. — Aestival Icavcs simulating 

 those of V. palmata, but quite glabrous ; truncate at base or shallowly 

 cordate; middle lobe disposed to be narrowly deltoid; autumnal and 

 earliest vernal leaves but slightly incised; eleistogamous flowers on 

 erect peduncles, producing green capsules 8-12 mm. long. The aver- 

 age number of seeds in 28 capsules was 14.36, showing about 80 per 

 cent of unfertilized ovules. — Two good plates of this, drawn by Mr. 

 Theo. Holm, are to be seen in Pittonia iii, pi. vii & viii. On page 

 256 Prof. Greene disposes of the plant as a "cut-leaved form" of T. 

 emarginata, growing with the typical form that has "uncut trigonous 

 foliage." I am under great obligation to Mr. Holm for a dozen live 

 plants of these forms from Brookland, D. C, that I have grown for 

 over a year; the hybrid shows remarkable vigor. Mr. House col- 

 lected the same thing at Hyattsville, Md., June 4, 1905, no. 937. Mr. 

 Witmer Stone also has it from Tuckahoe, Cape May, N. J., growing 

 with both parents, Aug. 25, 1901 (Proc. Acad. Phila., Oct., 1903, pi. 

 xxxvi, fig. v.); also A. A. Heller, near Beartown, Pa., June 8, 1901. 



I pass next to speak briefly of eight hybrids between species of the 

 sagittata-rucullata subgroup and those of the afpnis-palmata subgroup. 

 The latter have ovoid short-auricled eleistogamous flowers, on tlecum- 

 bent peduncles, and the capsules are usually reddish brown. 



18. V. FiMBRiATULA X PALMATA Robiusou in hb. — Aestival leaves 

 ovate-oblong in general outline, acute or pointed, with one to three 

 incised lobes on either side below the middle, clothed with minute soft 

 pubescence; eleistogamous flowers intermediate between those of 

 parent species; capsules somewhat dotted with brown, infertile. 



