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., Cxiba, ^n«.)— Cat-tail. 



Order NAIADALES. 



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



phyllodia. Flowers usually symmetrical. Perianth wanting or imperfect. 



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

 carpellary. 



Gynoecium of distinct carpels : stigmas disk-lilie or cup-like. 



Pam. 1. Zannichelliacbae. 

 Gynoecium of united carpels : stigmas slender. Fam. 2. Cxmodoceaceae. 



Family 1. ZANNICHELLIACEAE. Pondweed Family. 



Aquatic caulescent herbs. Leaves alternate, filiform or with broad 

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

 a spathe. Androecium of 1, or mostly 2-4 distinct stamens. Gynoecium 

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



stigma terminating a long style : anther 1. 1. Zanxichellia. 



Stigma sessile, anthers 2. 2. Ruppia. 



^ 1. ZANHTCHELLIA 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. 



lL\. 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. 



t'^\. E. 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. 



i' 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. Gynoecium 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 aehenes 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. Halodule. 



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

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

 long-exserted. 



