. Handbook of flower pollination : based upon Hermann Mu?ller's work 'The fertilisation of flowers by insects' . Fertilization of plants. 412 ANGIOSPERMAE—DICOTYLEDONES 977. C. tetrandrum Fries (= C. alternifolium, according to the Index Kewensis). (Warming, ' Arkt. Vaxt. Biol.,' pp. 4-7.)—Warming investigated plants from Spitzbergen. The flowers are greenish, less open than in C. oppositifolium, and with a scarcely developed nectary. Besides homogamy, slight protandry was observed. Automatic self-pollination regularly obtains by contact of the stigmas with the anthers of the two outer stamens
. Handbook of flower pollination : based upon Hermann Mu?ller's work 'The fertilisation of flowers by insects' . Fertilization of plants. 412 ANGIOSPERMAE—DICOTYLEDONES 977. C. tetrandrum Fries (= C. alternifolium, according to the Index Kewensis). (Warming, ' Arkt. Vaxt. Biol.,' pp. 4-7.)—Warming investigated plants from Spitzbergen. The flowers are greenish, less open than in C. oppositifolium, and with a scarcely developed nectary. Besides homogamy, slight protandry was observed. Automatic self-pollination regularly obtains by contact of the stigmas with the anthers of the two outer stamens. This must be effective, for almost every flower sets Fig. 133. Chrysosphnium tetrandrum. Fries (after E. Wanning). .^4. Longitudinal section through an almost closed flower. Anthers unripe, styles short. B. Do. through a fully open young flower. The stigmas touch some of the ripe anthers, which deposit a quantity of pollen upon them (cf. D). C. A fenilized flower. The formation of seeds and setting of fruit have begun ; the free parts are more erect, and have closed in somewhat. D. Style of i? more highly magnified, showing the stigma covered with numerous pollen-grains. E, F. Sterile stamens, the latter in connexion with its perianth leaf. G. Longi- tudinal section through a sterile stamen. H. Normal anther. J. Scarcely ripe fruit. K. Do. through a similar fruit; the seeds have been removed, but some of the funicles are still present in part. (A^ B, C, /, K y. 8.) 271. Heuchera L. 978. H. cylindracea Lindl.— Visitors.—Loew observed 2 bees in the Berlin Botanic Garden (Apis mellifica L. 5, skg., and Halictus cylindricus F. 5, do.). 272. Tellima R. Br. 979. T. grandiflora R. Br.— Visitors.—Loew observed a bee (Apis mellifica L. 5) and a butterfly (Pieris brassicae Z.), skg., in the Berlin Botanic Garden. 273. Tiarella L. 980. T. cordifolia L.—Francke describes this species as protogynous (' Dissert.,' Halle, 1883). The anthers ripen in succession
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