B5

Gilia micrantha

Short style 15, 14, 14,

—  (9 short)—(9 long)— manured

Long 12, 12, 11, 12, 11, 12, 13, 11, 11

— 996 9 11.7 [calculations not transcribed]

[annotation by Darwin:] (Stigma of long-styled more papillæ)

Short 13, 13, 13, 12, 13, 12

[calculations not transcribed]

Pollen of short styled to pollen of long as 100 to 81.

Stigma of long styled is to stigma of short as 100 to 42

See Forms of flowers, p. 119: "A few flowers sent me from Kew had been somewhat injured, so that I cannot say anything positively with respect to the position and relative length of the organs in the two forms. But their stigmas differed almost exactly in the same manner as in the last species; the papillæ on the long-styled stigma being longer than those on the short-styled, in the ratio of 100 to 42. My son measured nine pollen-grains from the long-styled, and the same number from the short-styled form; and the mean diameter of the former was to that of the latter as 100 to 81. Considering this difference, as well as that between the stigmas of the two forms, there can be no doubt that this species is heterostyled. So probably is Gilia nudicaulis, which likewise belongs to the Leptosiphon section of the genus, for I hear from Professor Asa Gray that in some individuals the style is very long, with the stigma more or less exserted, whilst in others it is deeply included within the tube; the anthers being always seated in the throat of the corolla."