146 DIGITALIS. ' [CHAP. firmness with which they are closed, and in the posi- tion of the honey, which lies at the basis of the corolla, and does not penetrate into the short spur, which is hairy, and therefore not suited for such a purpose. They are almost always fertilised by humble bees, though… … FIG. 103 — Bartsia odontites. enough to fill the bell, and thus to deposit pollen on the stigma. The flower is proterandrous, but appears to be self-fertile if the visits of humble bees are delayed or prevented. The cells of the anthers, as Ogle has pointed out, are at first transverse (Fig. 100),…
Flowers -- Color · Fertilization of plants by insects · Plants -- Variation
Internet Archive · University of California Libraries · Public domain (published before 1931). Free to use for anything.
![An illustration from Thirty-eight plates with explanations; intended to illustrate Linnaeus's System of vegetables, and particularly adapted to the Letters on the elements of botany [J.J. Rousseau] / By Thomas Martyn. (1799)](https://img.insideoutlibrary.com/img/200/wellcome-wellcome_b28780450-26-1.webp)