SOUTHERN CALIFORNIA ACADEMY OF SCIENCES 21 
Spikes brown, simple; rhizomes black........ 24+. C. marcida 
Heads ovoid or globulose; spikes simple. 
Perigynia suborbicular, marginless......25. ©. Bernardina 
Perigynia ovoid-acuminate, margined.......... 26. C. densa 
Perigynia narrowly-lanceolate, margined.....27. C. nervina 
Heads narrow of a few separated spikes..... 28. C. Hookeriana 
B. Staminate or pistillate flowers in separate spikes, or 
intermingled, or plants dioecious. 
Pernigynia mareginless. 
Spikes distant. 
Spikes subglobose, few-flowered.29. C. stellulata ormantha 
Spikes oblong, many-flowered........... 30. C. Bolanderi 
Spikes contiguous, linear-oblong.......... 31. C. pregracilis 
Perigynia margined. 
PAINS NAC. eet ee eyo eee fest) eatee 2k 24. C. marcida 
Rhizomes brown. 
Heads broadly ovoid, compact........... 23. C. Douglasii 
lead so blonio- 1OOSC%s 0... 2 se. se So. oe 32. C. siccata 
C. Staminate flowers at the base of the spikes. 
Spikes distant. 
Spikes subglobose, few-flowered ..29. C, stellulata ormantha 
Spikes oblong, many-flowered............. 30. C. Bolanderi 
Spikes contiguous, linear-oblong............ 31. C. pregracilis 
Spikes loosely or compactly aggregated. 
Spikes green or greenish. 
Spikes silvery-green, 5-10 mm. long...........33. C. feta 
Spikes brownish-green, 7-15 mm. long..... 34. C. specifica 
Spikes brown or tawny. 
Beco vila MmARoMMeESSe GmlOO tM ye es ee 35. C. illota 
Perigynia wing-mareined, serrulate. 
Perigynia brown, stronely convex........ 32. C. siccata 
Perigynia thin and seale-like. 
Braets ieonspicuous, shorter than the heads. 
Spikes distinet in a cluster. 
Spikes oblong, 4-6 mm. lone....... 36. C. Prestii 
Spikes globulose, 3-5 mm. long....387. C. subfusea 
Spikes in a compact héad..... 38. C. festiva stricta 
Braets conspicuous, exceeding the heads 
39. C. athrostachya 
Section 14 ACROARRHENA, Fries, Summa, 73. Staminate 
flowers borne at the summit of the spikes, or 1n a few species some spikes 
wholly pistillate, or the plants diwcious. 
*Spikes stramineous or light brown. numerously aggregated in de- 
compound clusters, which are paniculately disposed 1n an elongated head, 
usually interrupted below, staminate flowers in an evident, persistent 
