88 I. M. JOHNSTON 



Silene verecunda Wats, platyota (Wats.) Jeps. Frequent in the Transition 

 Zone. In the higher part of this zone it is very common in moist shaded 

 ground under the pines. Here the plants are lower and much more slender 

 than they are at lower levels and the calyx usually has a distinct purplish 

 color which is absent in the Lower Transition form. (Nos. 1386, 1481, 1528, 

 1671.) 



RANUNCULACEjE 



Aquilegia truncata F. & M. Common in springy places. Transition Zone and 



lower. (No. 1532.) 

 Delphinium hesperium Gray, var. recurvatum (Greene) Jeps. "San Antonio 



Mts., 5750 ft. alt. Hall" and "Lytle Creek Canon, 5500 ft. alt. Hall" ace. 



Davidson, (Muhl. 4:34, 1908). 

 Here, very likely, belongs the common larkspur noted in Prairie Fork of 



which we have seen only fruiting specimens. 

 Thalictrum polycarpum Wats. Common in moist ground bordering streams in 



the upper parts of Prairie Fork San Gabriel River and North Fork Lytle 



Creek, Upper Transition Zone, alt. 7000-8000 ft. Also at 5000 ft. in Prairie 



Fork. (Nos. 1677, 2093.) 

 Clematis ligusticifolia Nutt. Ranges from the lower canons up to an altitude of 



7000 ft. in the pine belt. 



LAURACE.E 



Umbellularia calif or nica Nutt. This Upper Sonoran tree ranges a short way up 

 into the pine belt. 



PAPAVERACE^E 



Argemone platyceras Linkk. & Otto, var. hispida (Gray) Prain. With wide distri- 

 bution in the mountain but not especially common. In the Upper Transi- 

 tion Zone at 9000 ft. on the Devils Backbone and at 8000 ft. alt. at the Old 

 Gold Ridge Mine. In the Lower Transition it is not uncommon in the sandy 

 ground in Prairie Fork and North Fork Lytle Creek. 



CRU IFERAE 



Draba corrugata Wats. D. vestita Davidson. A very common and characteristic 

 plant of the Canadian Zone. Usually growing under the pines, but on Baldy 

 Summit it is common among loose rocks. 



A plant collected by Burlew on Baldy Summit was made the type of D. 

 vestita, a species described by its author as differing from D. corrugata in being 

 more hirsute and more compact in habit, and in having shorter petals and 

 less corrugated fruit. Dr. Davidson mentions certain collections from the 

 San Jacinto Mts. that in his mind represent typical corrugata. From our 

 studies of herbarium material it appears that D. corrugata is represented in 

 the San Jacinto Mts. by a very distinct geographical variety that is char- 

 acterized by its long petals, slightly smaller and more contorted fruit and by its 

 slender, naked, unbranched stems bearing a simple, open few flowered raceme. 



