d. "Flora deels it and seeds. 
é. Variations in size of plants different 
years. 
f. Annuals best adapted to desert life. Pass 
dry time in seed. 
(3). True desert flora, perennial. 
a. ome tendency to flower in December 
but too cold for many species. 
b. Flower and fruit in spring. 
c. As hydrostatic water is used they 
change, i. e., tropophile habit. Two 
types, 
(a) shed leaves, or 
(b) die down to the ground or 
nearly so. 
Ga mOharichen ote plants, thes. asitulas, 
3—4" feet. 
i. Compact, rounded growth. 
Zeca entice eiay sleaves: 
3. Two types of shrubs. 
Larrea tridentata. Numerous 
branches from subterran- 
ean source. 
Peucephyllum Silatninmthee 
like, dies. 
(4) Few plants with thick roots. 
(5) Suffrutescents—large number. 
Lower portion shrubby and remains green. 
Transpires and extended water system ab- 
sorbs enough water. 
(6) True desert plants dependent in dry period on 
hydrostatic water. 
Rains very little, immediately re-evaporated. 
(7) Trees (Mesquits) only around basins where 
there is ground water. 
(8) Cacti, greasewood, chenopods. 
4. General Consideration. 
Season of maximum rainfail in different deserts. 
Vegetation more dependent on ground water than rainfail. 
43 
