244 BARTRAM: BOTANIZING IN SOUTHERN ARIZONA 
Ciematis DrumMonpi Torr. & Gray. Frequent on the plains west of 
Tucson. : 
ESCHSCHOLTZIA MEXICANA Greene. A few flowers on sheltered banks 
in January 
YSANOCARPUS AMPLECTENS Greene. Locally abundant in damp 
pockets near Picture Rocks and at Robles Pass. Sparingly in flower on 
January 12th but plentiful and in mature fruit ten days later. The curious 
disk-shaped pods with perforated wing margins mark this off at once from 
all other crucifers of the region. 
STREPANTHUS ARIZONICUS S. Wats. Frequent in the shade of bushes 
near Picture Rocks. 
LEPIDIUM HIRSUTUM Rydb. Infrequent on lower slopes of Santa Cat- 
alina Mountains. 
LEPIDIUM LASIOCARPUM Nutt. Common in sandy plains and dry washes. 
LESQUERELLA FENDLERI (Gray) S. Wats. Flowering early along dry 
roadsides and on open slopes in the foothills. 
LESQUERELLA PURPUREA (Gray) S. Wats. An attractive early flower 
of rock crevices in the foothills and lower slopes of the canyons. In vigor- 
ous tufts the stems sometimes attain a length of nearly two feet. 
DRABA CUNEIFOLIA Nutt. Widely distributed on shaded knolls and 
banks along the a 
ARABIS PERENNANS S. Wats. The purple medics Bike quite a touch of 
coior to the ledges along the arroyos west of Tuc 
BRASSICA NIGRA (L.) Koch. Occasional in cultivated fields. 
SOPHIA OCHROLEUCA Wooton. Frequent in sheltered shady spots. 
DRYOPETALON RUNCINATUM Gray. Rather local in damp shaded 
tock pockets. The delicate white flowers form a pleasing contrast with their 
rough arid setting. 
SEDUM GRIFFITHSII Rose. Ledges in Sabino Canyon. 
FENDLERA RUPICOLA Gray. Ledges in Sabino Canyon. Leaves and 
old a persiste 
MICRPOHYLLUS Gray. Frequent on open rocky slopes 
HILAD: 
in * foothills. “ sheltered places the flowers were opened in profusion by 
uary. 
mid Janu 
PLATANUs WricutTi1 S. Wats. In the mouth of Sabino Canyon. 
VAUQUELINA kee dela (Torr.) Sarg. Ledges in Sabino Canyon at 
about sei feet elev 
ANDRA ERIOPHYLLA Benth. One of the most attractive of the 
early suihes flowers. Abundant on open rocky slopes in the foothills. 
ACIA CONSTRICTA Benth. Frequent on the plains. Pods more per- 
sistent than A. Greggii. 
Acacia GreGccit Gray. This and A. constricta are character istic 
thorny shrubs of the gravel plains. 
