. Handbook of flower pollination : based upon Hermann Mu?ller's work 'The fertilisation of flowers by insects' . Fertilization of plants. PRIMULACEAE 75 1829. P. saccharata Mill.— Visitors.—Loew observed the bee Anthophora pilipes F. i, skg., in the Berlin Botanic Garden. 1830. P, sinensis Sabine. (Ljungstrom, Bot. Not., Lund, 1884, pp. 171-4.)— Ljungstrom observed cleistogamous flowers on plants of this species cultivated under glass. These possessed a bell-shaped calyx, and a short closed tubular corolla, with faint indications of lobes, and of a pale yellowish green colour. The anthers were
. Handbook of flower pollination : based upon Hermann Mu?ller's work 'The fertilisation of flowers by insects' . Fertilization of plants. PRIMULACEAE 75 1829. P. saccharata Mill.— Visitors.—Loew observed the bee Anthophora pilipes F. i, skg., in the Berlin Botanic Garden. 1830. P, sinensis Sabine. (Ljungstrom, Bot. Not., Lund, 1884, pp. 171-4.)— Ljungstrom observed cleistogamous flowers on plants of this species cultivated under glass. These possessed a bell-shaped calyx, and a short closed tubular corolla, with faint indications of lobes, and of a pale yellowish green colour. The anthers were very small, and also the pollen-grains, these being only 14 /x long, while those of the long- and short-styled chasmogamous flowers were respectively 32 /a and 24 /x in length. One plant was long-styled, with the style bent in the middle and enclosed in the corolla. In short-styled flowers the st^le was straight. Fruits and seeds were not observed. 544. Hottonia Boerh. Flowers heterostylous dimorphous, with concealed nectar, secreted at the base of the ovary and stored up in the corolla-tube. Sometimes cleistogamy. 1831. H. palustris L. (Darwin, 'Forms of Flowers,'pp. 50, 52, 252, 254; Sprengel, ' Entd. Geh.,' p. 103; John Scott, J. Linn. Soc, Bot., London, viii, 1865; Herm. MuUer, 'Fertilisation,' pp. 386-9, ' Weit. Beob.,' IH, p. 65; Knuth, ' Bloe-. FlG. 246, Hottonia palustris, L. (after Henu. Miiller). (i) Long-stylcd flower. (2) Stigmatic papillas of do. (3) Short-styled flower. (4) Stiftnatic papillae of do., enlarged to same scale as (2). menbiol. Bijdragen '; MacLeod, Bot. Jaarb. Dodonaea, Ghent, v, 1893, pp. 446-7.)— Sprengel discovered heterostyly in this species, about which he makes the following remarks (loc. cit.): ' Some plants only bear flowers with stamens inside the corolla-tube but the style projecting from it, and others only flowers with the style shorter and the stamens longer than the tube. I do not believe that this is accidental, but an arrange
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