1916.] REPORT OP FIELD TRIPS 25 



tufted or spreading growth. It was demonstrated how terminal 

 growth is prevented on shrubs and trees exposed to much wind, 

 while lateral twigs develop more fully, producing the one-sided 

 effect seen in the woody plants on coasts or hills facing the sea. 

 The species observed most closely were Ammophila arenaria 

 (Beach Grass or Arram Grass), Elymus arenarius (Sea Lyme 

 Grass), Lupinus arboreus (Tree Lupine), Abronia latifolia 

 (Yellow Sand Verbena), and Cupressus macrocarpus (Mon- 

 terey cypress). 



February 28, 1914. — Leader, Miss Harriet Walker. Locality, Land's 

 End, San Francisco. An observation of the permanent growth 

 that can be found on the seaward cliffs was made. The grasses 

 Ammophila (Beach-Grass) and Elymus (Wild Rye) and a 

 sturdy Equisetum (Horsetail Rush) bind the shifting sand, 

 and Salix lasiolepis (Arroyo Willow) is fixed on the banks. At 

 this date Frag aria chilensis (Sand Strawberry), Sanicula 

 arctopoides (Snake Root) and Dentaria integri folia (Milk- 

 maids) were in full bloom; while belated blossoms of last 

 year's Grindelia (Gum Plant) and Eriophyllum staechadi- 

 folium (Lizard Tail) were to be seen. 



March 14, 1914. — Leader, Mrs. Guy Smith. San Bruno Hills were 

 visited for the study of Iris longipetala. Hundreds of acres are 

 covered with this species. 



March 28, 1914. — Leader, Mr. L. S. Smith. Locality, Mt. Tamalpais. 

 Two characteristic associations were observed, the chaparral 

 and the redwood floor. In the former two or three species of 

 Ceanothus (Mountain Lilac) and Arctostaphylos were found in 

 blossom; while along the trails and open spots many liliaceous 

 plants and annuals were in flower. On the redwood slopes Van- 

 couveria and Oxalis oregona were found. 



EXHIBITS. 



Autumn Exhibit op Native Flowering Plants. 



From October 13 to 17, 1913, the Society held an exhibit of 

 flowering plants at the Oakland Public Museum. A committee, of 

 which Mr. Guy Smith of San Leandro acted as chairman, made a 

 collection of about 300 species — 219 in flower, and others in fruit. 

 Most of them were taken from the Bay region, but some were sent 

 from Plumas, El Dorado and Amador counties, the Yosemite, and 

 the desert of San Bernardino County. 



(Calendar of meetings, field trips and exhibits to be continued.) 



