CYMODOCEACEAE. 3 



1. T. angustifolia L. Plants 1.5-3 m. tall: leaf -blades mostly 15-20 mm. wide: 

 pistillate portion of the raceme 10-20 mm. thick. — Lime-sinks, U. keys, L. keys. 

 — [E. K.] — {Ber., Bali., Cuba, Arit.) — Cat-tail. 



Order NAIAD ALES. 



Perennial, aquatic or marsh herbs. Leaves various, sometimes mere 



phyllodia. Flowers usually symmetrical. Perianth wanting or imperfect. 



Androecium usually of 1-4 stamens. Gynoeeium simple or several- 

 carpellary. 



Gynoeeium of distinct carpels : stigmas disli-like or cup-like. 



Fam. 1. Zannichelliaceab. 

 Gynoeeium of united carpels : stigmas slender. Fam. 2. Cxmodoceacbae. 



Family 1. ZANNICHELLIACEAB. Pokdweed Family. 



Aquatic caulescent herbs. Leaves alternate, filiform or with broad 

 blades, entire. Flowers perfect or monoecious, in spikes or clusters, from 

 a spathe. Androecii;m of 1, or mostly 2-4 distinct stamens. Gynoeeium 

 of several distinct carpels. Fruit a cluster or spike of drupelets. 



Stigma terminating a long style : anther 1. 1. Zannichellia. 



Stigma sessile, anthers 2. 2. Rdppia. 



1. ZANNICHELLIA L. Delicate herbs of fresh or brackish water. Leaves 

 with narrow blades and inconspicuous bases. Flowers monoecious: staminate 

 with 1 stamen; pistillate with 2-6 carpels together. Drupelets clustered, curved, 

 crested. 



1. Z. palustris L. Leaves 2-7 cm. long, acute: drupelets 2-4, or sometimes 6, 

 together, the body 2-4 mm. long, short-stipitate. — Pools and creeks. — [E. K.] — 



HORNED-PONDWEED. 



2. RUPPIA L. Delicate herbs of salt or brackish water. Leaves with 

 slender blades and conspicuous bases. Flowers perfect. Stamens 2. Carpels 4. 

 Drupelets clustered, oblique, crestless. 



1. R. maritima L. Leaves 2.5-4 cm. long, capillary at the apex: drupelets few, 

 the body ovoid, gibbous at the base, long-stipitate. — Pools and creeks, L. keys. — 

 [E. K.] — (Ber., Bah., Cuba, Ant.) — Ditch-grass. 



Family 2. CYMODOCEACEAE. Manatee-grass Family. 



Submerged herbs with jointed rootstocks. Leaves clustered at the 

 nodes or on short branches, each with a sheath and a narrow blade. Flowers 

 monoecious or dioecious. Perianth wanting. Androecium of a single 

 anther terminating a long filament. Gynoeeium of 2 distinct inequilateral 

 carpels, each terminating in a style and 2 elongate stigmas or of one carpel 

 terminated by a single stigma. Fruit a pair of obliquely ovoid achenes or 

 a single achene. 



Anthers equally attached to the stalk : stigmas 2 : leaf-blades terete. 1. Cymodocea. 

 Anthers unequally attached to the stalk : stigma 1 : leaf-blades flat. 2. Haloddle. 



1. CYMODOCEA Koen. Eootstocks elongate. Leaves terete or half- 

 terete above the sheaths. Flowers hidden in the leaf-sheaths, or the staminate 

 long-exserted. 



