202 



ANGIOSPERMAE—DJCOTYLEDONES 



504. C. perfoliata Donn.— According to Kerner ('Nat. Hist PI.,' Eng. Ed. i, 

 II, p. 365), autogamy takes place towards the end of anthesis, the pollen-covered 

 anthers being pressed against the stigma by the closing of the perianth. 



143. Calandrinia H. B. et K. 



When the flowers fade, the petals become pulpy, the surface being covered with 

 a thin layer of fluid which oozes out of the tissues. This is sought out and licked 

 by flies, which effect cross-pollination (Kerner, 'Nat. Hist. PI.,' Eng. Ed. i, II, 

 p. 171). 



505. C. compressa Schrad. — In this species the anthers of the ephemeral 

 blossoms are at first remote from the stigma. At a later stage they are applied 

 to the stigma by the closing of the flower (Kerner, ' Nat. Hist. PI.,' Eng. Ed. i, 

 II, pp. 346-7). 



XVII. ORDER TAMARISCINEAE DESV. 



144. Myricaria Desv. 



Small red, slightly protogynous flowers, with concealed nectar, secreted by 

 the inner sides of the filaments. All are entomophilous, according to Niedenzu 

 (Engler and Prantl, 'D. nat. Pflanzenfam.,' Ill, 6, p. 290). 



Fig. 60. Myricaria germanica^ Desv. (after Herm. Mailer). A. Section through an open flower; 

 seen from the side. B. Section through a flower in the act of automatic self-pollination ; seen from the 

 side. C. Sexual organs of a bud, with stigma already receptive. D. Sexual organs of a flower 

 completely closed during rain. E. Some of the stamens seen from within, with the nectary (k). 



506. M. germanica Desv. (Herm. Miiller, ' Alpenblumen,' pp. 164-5.) — In 

 this species the stigmas are receptive, even before the flowers open, and the anthers 

 dehisce successively soon after this takes place. The stamens and stigma both 

 continue functional, so that in bad weather automatic self-pollination must take 

 place in the half-closed or completely closed flower. During favourable weather 

 insect visitors may eff'ect crossing. (See Fig. 60.) 



Visitors. — Herm. Miiller observed a fly and a Lepidopterid. 



