BARTRAM: BOTANIZING IN SOUTHERN ARIZONA 245 
PROSOPSIs GLANDULOSA Torr. This is the main source of firewood for 
the region. 
AcuaN JAMEsiI (Torr. & Gray) Kuntze. Pods persistent through the 
winter 
sta CovesiI Gray. Scattered sparingly over the open gravel plains. 
Pods and leaves persistent. 
HOFFMANSEGGIA DENSIFLORA (Benth.) Gray. On sandy plains. Pods 
persistent. 
PARKENSONIA MICROPHYLLA Torr. A thorny shrub or small tree of 
the foothills and adjacent plains. On sheltered sunny slopes a few flowers 
were in evidence by late January 
RCIDIUM TORREYANUM Sarg. A low nearly leafless shrub occuring 
sparingly along washes in the plains. 
KRAMERIA GLANDULOSA Rose & Painter. A oe flowerless shrub 
of the plains with soft silky oe young g 
NISLOTUS BRACHYCARPUS (Benth.) Rydb. The broad leaflets and 
villous sagminceds ‘Sidebee this Fes sharply from the following where 
they grow toget 
ANISLOTUS TRISPERMUS (Greene) Woot. & Standl. With the preceding 
in a sandy bed of an arroyo near Picture Rocks. Just coming into flower 
ANISLOTUS PUBERULUS (Benth.) Woot. & Standl. What seems to be 
a form of this species was in full flower on the ledges of Sabino Canyon at 
about 3000 feet elevation. 
OSELLA Parry! (Torr. & Gray.) Heller. This inconspicuous little 
ae is peer typical of arid rocky hillsides in the foothills. 
ROSELLA GREGG (Gray) Heller. Abundant on rocky spurs and slop2s 
near Agua Calgiente but not observed elsewhere 
Nissoiia Scuotti (Torr.) Gray. Pods and leaves persistent. Frequent. — 
AsTRAGALUS NuTTALLiANus DC. Local on the plains. In flower 
in January. 
CRACCA TENELLA Gray. Localized on dry sunny ledges near Robles Pass. 
GaALacTIA WricHtu Gray. Twining over low bushes in the foothills. 
Leaves and pods persistent. 
OLNEYA TESOTA Gray. Foothill slopes and nearby plains. 
ERODIUM CICUTARIUM (L.) L’Her. Abundant in waste places and 
on open sandy 
ERopiIuM TEXANUM Gray. Gravelly Knolls near Picture Rocks. 
LEA GLUTINOSA (Engelm.) Rydb. The most abundant and char- 
os eal of the plains. 
KOEBERLINIA SPINOSA Zucc. Frequent on knolls and in thickets in 
‘the plains. 
JANuSIA GRACILIS Gray. Twining about bushes on open rocky hillsides. 
