gee BOTANICAL GAZETTE [NOVEMBER 
rocks, although they may often be exposed to a scorching sun for 
many hours daily and be without rain for days or even several 
weeks together. There 4s a copious dew in the valley each clear 
night, however, while on cloudy nights the fog probably condenses 
on the rocks and plants of its floor. It is likely that Gloeocapsa 
may thus be able to carry on photosynthesis and growth for some 
hours each day, even without rain. 
The bareness of the valley bottom recalled that of the more 
barren of the stony deserts of Arizona as they appear in early 
summer. The general aspect of this valley differed from that of 
these deserts in the absence of cacti and of all larger woody plants. 
No plants of this valley exceeded a meter or two in height except 
where, at the very edges of the valley, considerable top soil, that 
had washed down from the hillsides, afforded better conditions for 
plant growth. Here several species of shrubs grew to two or three 
meters in height, and in wetter soil considerable stands of Arundo sp. 
had established themselves (fig. 1, x). The shrubs and cane 
together made a conspicuous verdant border to the generally desert- 
like valley floor. 
When the floor of the valley, especially the portion along the 
trail from the junction of the Cascade and Green rivers to Farm 
Hill Coffee Works, was more carefully examined, the scattered 
vegetation was found to include the following plants: 
ALGAE . DIcoTYLEDONEAE 
Gloeocapsa magma (Breb.) Kiitz. Piper sp. ? (shrub or tree) 
Pilea microphylla L. (Liebm.) (annual 
to perenni 
Iresine celosioides L. (half shrubby) 
Begonia acuminata Dryand. (half 
PTERIDOPHYTA shrubby) 
Dryopteris sligophylla Maxon Asclepias curassavica L. (perennial herb) 
Blechnum occidentale L. Asclepias nivea L. (perennial herb) 
oe tartarea (Sw.) Philibertella clausa (Jacq.) Vail (shrubby 
Des vine) 
Trismeria trifoliata (L.) Diels Duranta plumieri Jacq.(shrub 2-3 meters) 
Pityrogramma calomelaeana (L.) Verbena bonariensis L. (perennial herb) 
Link anum torvum Sw. (half sh rubby) 
Pteris longifolia L. Maurandia scandens A. Gr. (shrubby 
Aneimia adiantifolia (L.) Sw. vine) 
