SCROPHULARINEAE 



219 



its proboscis and effect crossing ; and somewhat^below this a * humble-bee door ' which 

 plays the same part as regards humble-bees. 



Kerner ('Nat. Hist. PL,' Eng. Ed. i, II, p. 366) describes the stigma as at first 

 projecting beyond the anthers, so that cross-pollination is effected by insect-visits. 

 Should these fail, the corolla elongates, pushing the epipetalous stamens forward, 



Fig. 314. Rhinanthus major, Ehrh., var. hirsuius, All. (after Herm. 

 Mttller). A. Flower after removal of the calyx, in longitudinal section. 

 B. Uppermost part of the flower, after removal of the right half of the corolla, 

 seen from the right side. C Upper part of a flower, seen from the front. 

 D. Do., after removal of lower lip (X 3i). hik, humble-bee door; fth, 



Lepidopterid door ; , nectary ; ov, ovary ; sf, stigma. 



while the stigma remains in its original position. It follows that pollen which has 

 fallen out of the flaccid receptacles and remains clinging to the anther-hairs or the 

 inwardly projecting folds of the corolla will be transferred to the stigma. 



Visitors. Herm. Muller observed 2 Lepidoptera and 6 humble-bees, Bombus 

 mastrucatus Gerst., among the latter perforating the flowers and stealing nectar. 



2169. R angustifolius C, C. Gmel. (=R. alpinus Koch). (Herm. Muller, 

 ' Alpenblumen ' ; Kerner, ' Nat. Hist. PI.,' Eng. Ed. i, II, pp. 273, 366.) This species 



Fig. 315. Rhinanthus angustifolius, C. C. Gmel (after Herm. Muller). A. A very young Hower, 

 seen from the side. B. A somewhat older flower, partly dissected, after removal of the calyx. C. A still 

 older flower, partly dissected. D. A flower of the same age as B, seen directly from the front ( x 3i). 



ca, calyx ; , corolla ; fi, filaments ; ft, ' Lepidopterid door ' ; ht, closed ' humble-bee door ' ; , nectary ; 

 ov, ovary ; p, folds of the corolla ; s s, sepals ; st, stigma. 



bears protogynous Lepidopterid flowers. The * humble-bee door ' possessed by other 

 species of the genus is closed, but a ' Lepidopterid door * is present, through which only 



