. Handbook of flower pollination : based upon Hermann Mu?ller's work 'The fertilisation of flowers by insects' . Fertilization of plants. LABI ATAE 305. ' Blutenbiol. Floristik,'pp. 391,394,399; Knuth,',"Blutenbiol. Beob. a. d. ')—The dirty-red flowers of this species possess a nectar-guide on the lower lip in the form of white lines pointing towards the corolla-tube. As in most labiate flowers, the lower lip forms a convenient alighting-platform, and its lateral lobes act as holdfasts for their fore- and middle-legs: a longitudinal furrow on the lower lip
. Handbook of flower pollination : based upon Hermann Mu?ller's work 'The fertilisation of flowers by insects' . Fertilization of plants. LABI ATAE 305. ' Blutenbiol. Floristik,'pp. 391,394,399; Knuth,',"Blutenbiol. Beob. a. d. ')—The dirty-red flowers of this species possess a nectar-guide on the lower lip in the form of white lines pointing towards the corolla-tube. As in most labiate flowers, the lower lip forms a convenient alighting-platform, and its lateral lobes act as holdfasts for their fore- and middle-legs: a longitudinal furrow on the lower lip serves as a guide to the proboscis. The nectar, secreted by the base of the ovary, is concealed at the bottom of the corolla-tube, which is 7 mm. long, and slightly widened at the top. It is accessible to a proboscis 6 mm. long, as the widening of the entrance permits the insertion of a bee's head to a depth of one mm. A circlet of stiff' hairs situated above the nectar is described by Sprengel as a nectar- cover. This is, however, unnecessary, owing to the horizontal position of the flower and the arching of the upper lip. Hermann Miiller considers the circlet as a protection against useless nectar-seeking flies, as it prevents their broad proboscides from entering, though it is no obstacle to those of bees. At the beginning of anthesis the stigmatic branches, still almost apposed, are situated behind the anthers. When these have dehisced, the style bends downwards, the papillose stigmatic branches diverging at the same time, so that they are first brushed against by a bee visitor. If the pollen is not removed by insects, a large part of it clings to the hairy margins of the upper lip, and the whole length (including the papillae) of the lower stigmatic branch, which bends down between the hairs, is dusted with the retained pollen, so that automatic self- pollination is effected. Schulz says that besides hermaphrodite flowers, gynomonoeciously distributed female ones also o
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