FLORA OF THE SAN ANTONIO MOUNTAINS 109 



Ceanothus intcgerrimus H. & A Quite common in the Lower Transition Zone on 



the north side of the mountain. Rare in the pine belt on the south side, but 



abundant in the Upper Chaparral. 

 Ceanothus divaricatus Nutt. Abundant in the Upper Chaparral Belt, from which 



it usually extends well up into the Lower Transition Zone. (No. 1577.) 

 Ceanothus cordulatus Kell. Very common in the Transition Zone on the north 



side of the mountains, 6000-8000 ft. alt.; not found on the south side although 



it reaches the dividing ridge crest. (No. 1424.) 

 Ceanothus greggii Gray. A large colony under the pines, 6600 ft. alt., in North 



Fork Lytle Creek. Lower Transition Zone. A common Upper Sonoran 



shrub of the desert borders. (No. 1668.) 



STERENLIACE.E 



Fremontia califbrnica Torr. Scarce in the pine belt in San Antonio Canon; in 

 Prairie Fork it is common and becomes a small tree. 



MALVACEAE 



Malvastrum Fremontii Torr var. orbiculatum (Greene) Johnston, comb, nov., M. 

 orbiculatum Greene. A few scattered shrubs were found on the broad open 

 gravelly floor of Prairie Fork, Lower Transition Zone, 5000-6750 ft. "Swart- 

 out Valley" ace. Abrams (Bull. N. Y. Bot. Gard. 6: 418, 1910). 



Our plants differ from M. Fremontii chiefly in their less densely woolly 

 calyces and in their shorter bracts. M. Davidsonii does not appear distinct. 

 (No. 1673.) 



VIOLACEiE 



Viola purpurea Kell. var. pinetorum Greene. A common and widely distributed 

 plant within our limits. We have observed it from 4500 ft. alt. in the Upper 

 Chaparral Belt up to 9660 ft., in the Canadian Zone, on Pine Mt. Summit. 

 Mrs. Wilder (No. 593) obtained specimens on the summit of Baldy. Usually 

 growing in dry ground under the pines. (Nos. 1281, 1760, 1734.) 



LOASACE.E 



Mentzelia l&vicualis T. & G. Dry sandy ground on both sides of the mountain. 

 Very abundant in both Prairie Fork and North Fork Lytle Creek. Col- 

 lected also in the Upper Transition Zone at 8000 ft. at the Old Gold Ridge 

 Mine. 



Mentzelia dispersa Wats. M . pinetorum Heller. Frequent in dry sunny ground 

 in the Transition Zone. It was found most abundantly on the south side of 

 the mountain where it was also collected in the Upper Chaparral Belt. This 

 determination, as in the following Menzelias, is by Mr. Macbride. (Nos. 

 1602, 1694, 2090.) 



Menzelia albicaulis Dougl. var. Veatchiana (Kell.) Urb. & Gilg. Frequent along 

 the lower edge of the pine belt. Very common on Brown's Flats. (No. 1755.) 



