12 



THE POLLINATION OF PEAR FLOWERS. 



LIST OF SELF-STERILE PLANTS AS GIVEN BY FOCKE. 



[AUTHORITIES FOR SELF-STERILITY ARE GIVEN IIS" SMA1,L CAPITALS.] 



Ranuvculus acris L. Focke. 



E. bulbosus L. Focke. B. auricomus L. and B. arvenais L. are fertile to 



their own pollen. 

 Papaver alpinum L. H. Hoffmann. 

 P. nudicaule L. Focke. 



Esclischoltzia calif ornica Cliam. Fr. Muller, Darwin. 



Hypecoum grandiflorum Cham. Hildebrand. 



Corydalis cava Schw. Hildebrand. 



Brassica rapa L. Focke. 



Cisius hybrid forms, Bornet. 



Beseda odorata Asso. Darwin. 



B. lutea L. Darwin. 



Ahutilon darwwii Hook. Fr. Muller, Darwin. 

 Erodium macradenum I'Herit. Fr. Ludwig. 



Bubus odoratus L., rarely fruits. Focke. B. vutl^amis fruits with its own pollen. 



B. spectabilisFnrsh, fully fruitful only under certain favorable conditions. Focke. 



Kerria japonica DC. Focke. 



Neviusia alabamensis Gray. Focke. 



Prunus Lusitanica L. Focke. 



Sanguisorba canadensis L. Focke. 



Ulmaria, species bear no fruit when isolated. FoCKE. 



Bosa setigera Mich., fruits sparingly. Focke. 



B. rugosa Thhg., fruits sparingly. Focke. 



B. beggeriana Schenk, fruits sparingly; most species of Bosa are self-fertile. 

 Focke. 



Pirns saJicifolia L. Seeds from fruits grown on a tree in a garden gave only hybrid 



seedliugs with P. covimniiis. Schubler, Focke. 

 Mespilns nigra Willd., under same circumstances as Pirus salicifolia gave only 



hybrid seedlings with AJ. luonogyna. 

 Passiflora alata Ait. Mowbray, Scott. 

 P. ramosa. Mowbray, Scott. 



Senecio, garden varieties of the subgenus Pericallis. Darwin. 



Lobelia fnlgens W. Gartner. 



L. cardinalis L. Focke. 



Tabernwmontana echinata. Fr. MtiLLER. 



Verbascum nigrum L. Gartner. 



V. phwiiiceum L. K()LREurER, Focke. 



V. phlomoides L. Focke. 



Bignonia sp. Fr. MOller. 



Lycinm rhotnbifoUnm ) both self-sterile, but each is fertile with the other's pollen. 



L. halim if olinm Mill. ) FoCKE. 



Daphne mezereum L. Fr. Ludwig, Focke. 



Maxillaria atro-rubens. Scott. 



Epidendrium cinnabarinum. Fr. Muller. 



Oncidium sphacelatnm hindl. Scott, MuNRO. 



0. divaricatum Lindl. Munro. 



0. microchilum Batem. Scott. 



O. cavendishianurn Batem. Riviere. 



0. crispum. Fr. Muller. 



0. flexaosum, and other species. Fr. MtiLLER. 

 Notylia sp. Fr. Muller. 



Burlingtonia sp. Fr. Miiller. . - . 



Bodriguezia sp. Fr. MtiLLER. 



Liliuni candidum Jj. Tinzman. 



L. bulbiferumLi. Focke. 



Hemerocallis flava'L. Focke. 



H. dumortieri. Morr. 



H. serotina. Focke. 



Hippeastrum aulicum and also a hybrid form. Herbert* 

 Gladiolns, hybrid form. Rawson. 

 Secale cereale. Rimpau. 



