652 orchidace^. 



Order NAIADACEJE. 



NAIAS, L. 



N. major, AH. Stem muricate ; leaves broadly linear, serrate-dentate, 

 with rauricave teeth, the sheaths entire ; flowers dioecious ; anthers 4-valved ; 

 style very short ; stigmas 3 ; aclienium elliptical, obscurely reticulate. — 

 South Florida. 



HALOPHILA, Thouars. 



Flowers dioecious, axillary, solitary. Perianth '2-leaved. Stamens 3, mon- 

 adelphous ; anthers 1-celled. Ovary 1-celled, with numerous parietal ovules. 

 Style long, filiform ; stigmas 3-5, penicillate. Capsule indehiscent. Seeds 

 globular. Embryo in copious albumen. — Marine herbs, with creeping stems, 

 and opposite pellucid stipulate leaves. 



H. Sngelmannii, Ascherson. Stem filiform, much branched ; leaves, 

 seemingly whorled at the end of the branches, linear-oblong, 3-nerved, 

 sharply serrulate (1' or less long); flowers and fruit unknown. — Muddy 

 coves along the west coast of Florida. 



POTAMOGETON, Tourn 



P. amplifolius, Tuck. Stem sin'iple ; leaves large, oblong or oval- 

 lanceolate, acutish, long-petioled ; the submerged ones lanceolate, undulate ; 

 stipules very long, pointed ; peduncles stout, fruit obliquely obovate, bluntly 

 keeled. — Ponds on the mountains of Georgia, and northward. 



P. pulcher. Tuck. Closely resembles the preceding, but the stipules 

 short and obtuse, and the fruit sharply 3 keeled on the back when dry. — 

 Georgia (Leconte). 



Order ORCHIDACE^. 



EPIDENDRUM, L. 



E. COChleatum, L. Stem tuber-like, ovate-lanceolate, 2-edged, scaly, 

 2-leaved ; leaves oblong-lanceolate, acute, as long as the few-flosvered scape; 

 flowers racemose, short-bracted ; sepals and petals greenish, broadly linear, 

 recurved ; lip much shorter, purple, entire, cordate-roundish, cochleate, acute, 

 2-callous at the base, — South Florida ( Garber). — Stem 1° high. Leaves 1' 

 wide. Flowers I'-H' long. 



E. umbellatum, Swartz. Stem leafy; leaves oblong, obtuse (2' -3' 

 long) ; flowers umbellate, greenish ; bracts ovate ; sepals oblong ; petals lin- 

 ear ; lip reniform-roundish, obscurely 3-lobed, veinj', 2-callous at the base; 

 column denticulate. — Miami, South Florida {Garber). — Stem 6' -12' high. 

 Flowers 6" -8" long. 



E. nocturnum, L. Stem leafy ; leaves oblong or oval, obtuse ; flowers 

 1-2, terminal, white or yellowish, longpeduncled ; petals large, linear, acu- 



