. Handbook of flower pollination : based upon Hermann Mu?ller's work 'The fertilisation of flowers by insects' . Fertilization of plants. SCROPHULARINEAE 20I) 2149, P. recutita L. (Herm. Miiller, ' Alpenblumen,' pp. 293-5; Kerner, 'Nat. Hist. PI.,' Engl. Ed. i, II, pp. 272-3.)—The lower lip of the red corolla of this species is symmetrically disposed, and only a small part of its base is apposed to the upper one. It possesses a median groove which, according to Hermann Mailer, conveniently guides the proboscis of a humble-bee to the nectar in the base of the flower, though Lindman says it is t
. Handbook of flower pollination : based upon Hermann Mu?ller's work 'The fertilisation of flowers by insects' . Fertilization of plants. SCROPHULARINEAE 20I) 2149, P. recutita L. (Herm. Miiller, ' Alpenblumen,' pp. 293-5; Kerner, 'Nat. Hist. PI.,' Engl. Ed. i, II, pp. 272-3.)—The lower lip of the red corolla of this species is symmetrically disposed, and only a small part of its base is apposed to the upper one. It possesses a median groove which, according to Hermann Mailer, conveniently guides the proboscis of a humble-bee to the nectar in the base of the flower, though Lindman says it is too narrow for this purpose. Humble-bees with a proboscis 8-9 mm. long can suck all the nectar. Kerner speaks as follows of the way in which pollen is discharged (op. cit., pp. 272-3).— ' The anthers in the flowers of this plant are borne on elastic filaments, and are regularly squeezed between the lateral walls of the helmet-shaped upper lip. No separation of the anther-valves is possible unless this lip expands and becomes laterally inflated. This is brought about in a very curious manner. When a humble- bee alights it seizes the projecting upper lip and bends it down through an angle of about 30°, this action being facilitated by the presence of strong ribs at the base of. Fig. 306. Pedicularis recutita, L. (after Henn. Miiller). A, Flower just before opening, seen from the side. B. Upper part of do., after opening. C Mature flower, seen from the side. D. Upper part of do., from the front. B. Uppermost part of the corolla, the left half having been cut through and bent down. F. Ovary and nectary. G. Cross-section of upper lip on xy in C(x 5). a, anthers ; f;r, style; /, /, fold and thickening on side of upper lip; n, nectary; ov, ovary; r, reflexed edge of upper lip; st, stigma; «, groove on lower lip; w, folds bounding do. the helmet on either side of the throat of the corolla, which act like levers, and communicate their motion to the entire upper lip. In consequence
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