FLORA OF THE SAN ANTONIO MOUNTAINS 87 



Eriogonum microthecum Nutt. We know it from only two stations. Along the 

 crest of the ridge a little east of Cucamonga Pk. Summit at about 8700 ft. 

 alt. and on the crest of the west spur of Baldy at 9000 ft. alt. Both stations 

 are but small colonies situated in very rocky ground along a ridge in the Cana- 

 dian Zone. Det, W. L. Jepson. (Nos. 1530, 1726.) 



Eriogonum umbellatum Torr. Frequent in dry ground under the pines in the 

 Lower Transition Zone. Never found in exposed places. 



Abrams (Fl. Los Ang. 109. 1917) gives Eriogonum stellatum as "common in 

 the coniferous forests." We think he must have reference to E. umbellatum 

 since a careful observation has failed to detect any of our plants with the 

 branched or bracted umbel rays which characterizes E. stellatum. (Nos. 

 1383, 1474.) 



Erigeron umbellatum Torr. var. minus Johnston. A much reduced, ecological 

 form which is common at the type station on Baldy Summit. The plant also 

 occurs on the other peaks where it is confined apparently to the higher parts 

 of the Transition Zone and to the Canadian. (Nos. 1584, 1692.) 



PORTULACACE.E 



Calyptridium monandrum Nutt. Not uncommon in dry ground along the lower 

 edges of the pine belt. 



Calyptridium Parryi Gray. Frequent in the Canadian Zone on bare stretches of 

 decomposed granite. 



Calyptridium umbellatum (Nutt.) Greene. Common in open ground under the 

 pines in the Upper Transition Zone and on bare ridges in the Canadian Zone. 

 Ranging between 7500 and 9700 ft. alt. (Nos. 1273, 1397.) 



Lewisia rediviva Pursh. Common in rocky exposed places throughout the Tran- 

 sition Zone. (Nos. 1280, 1412, 1470, 1493.) 



Montia exigua (T. & G.)\Jeps. var. viridis (Davidson) Jeps. Locally abundant on 

 a sunny talus slope in the Upper Transition Zone, at 7000 ft. alt. in Icehouse 

 Canon. Collected "near Old Baldy" at 5750 ft. alt. by Dr. Hall (no. 1245). 

 The type was collected in Rock Creek just west of our limits. (No. 2037.) 



CARYOPHYLLACE.E 



Arenaria Douglasii Fenzl. Abundant in the spring under the pines along the 



lower edge of the Transition Zone. (No. 1356.) 

 Arenaria Nuttallii Pax. var. gracilis Rob. Collected on "Mt. San Antonio" by 



Prof. McClatchie ace. Jeps. Fl. Cal. 

 Arenaria macradenia Wats. Collected by Dr. Hall at 6500 ft. alt. in Swartout 



Canon. (No. 1276.) 

 Silene Parishii Wats. Not common but generally distributed over the moun- 

 tains. Confined to the upper parts of the Transition and Canadian Zones. 



Not seen below 7000 ft. alt. Usually found in rocky places but occasional in 



decomposed granite. (Nos. 1531, 1553, 1563, 1670.) 

 Silene Lemmonii Wats. Lower Transition Zone, alt. 4500-6500 ft. in Cascade 



Canon. Shaded canon side. (No. 1276.) 



