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larged involucre. Prostrate, diffusely dicho- 
tomous; leaves opposite.— ©. 
1. P. prymarioipEes Fisch. & Mey. Com- 
mon. Spring. 
OrpER 3. PIPERALES. Flowers sessile, in 
dense spikes or racemes, bracteate, without 
perigonium. Stem articulate. 
Family 1. SAURUREA, 
Ovary central, compound of several follicu- 
lar carpidia; stigmas several. 
1. Anemopsis Nutt. YERBA MANSA,. 
Flowers in a dense, conical spadix, with a 
several-leaved, persistent, colored involucre; 
each flower subtended by a colored bract. Sta- 
mens adnate to the base of the ovary. Ovary 
immersed into a rachis, 1-celled, with parietal 
placenta. Fruita capsule, dehiscent from the 
apex. Leaves mostly radical.—2f. 
1. <A. Catrroryica Hook. Bracts and in- 
volucre white.—San Pablo marshes. Summer. 
Herb and root-stock aromatic. 
Family 2, CERATOPHYLLEA. 
Monececious. Involucre 12-cleft; lobes linear, 
truncate. 2 flowers: anthers o, sessile. 
flowers: ovary 1-celled, 1-ovulate; style termi- 
nal; fruit a nutlet, with persistent style and 
involucre. 2¢. Submersed aquatics; stem ar- 
