1912] EAST—HYBRIDS OF NICOTIANA 245 
and partially starved, the percentage of two-celled and three-celled 
capsules is much increased. The progeny of the starved plants 
gave only normal plants. 
Gray’s description of V. Bigelovii Watson is as follows: 
N. BicELovit Watson. A foot or two high: leaves oblong-lanceolate, 
sessile or nearly so; the lower (5—7 in. long) with tapering base; the upper (3 to 
43 in. long) more acuminate, with either acute or some with broader and 
partly clasping base;, inflorescence loosely racemiform, with all the upper 
flowers bractless: calyx teeth unequal, linear-subulate, about equalling the tube, 
surpassing the capsule: tube of the corolla 1} to 2 in. long, narrow, with a 
gradually expanded throat; the 5-angulate-lobed limb 12-18 lines in diameter. 
Fic. 2.—At left, Nicotiana quadrivalvis Pursh; at right, N. Bigelovii var. quadri- 
valvis; mature plants. 
Seed from Italy and from California gave plants agreeing per- 
fectly with this description. What was not so noticeable in the 
published descriptions of the two ‘species was the remarkable 
similarity of living plants of the two species NV. Bigelovii and N. 
quadrivalvis. The latter differs from the former only in its smaller 
size and the number of cells in the capsule. Even the viscid odor, 
which is stronger than in other species of the genus with which I 
am familiar, is the same in both. It naturally occurred to me that 
they might both be the same species, a thought simply a little more 
radical than the one that had already occurred to GRAY. 
The species were crossed, therefore, and gave perfectly fertile 
hybrids intermediate in character, with partial dominance of the 
