FLORA OP ST. CROIX AND THE VIRGIN ISLANDS. 97 



805. P. obtusifolia, Cas. DC, Dietr., Miq. a) and /?) clusiaefolia. 



Fl. April-July. On rocks and under shady trees in leaf-mould. Gre- 

 garious, not uncommon, a) all islands ; /S) St. Thomas (Crown). 



806. P. scandens, Ruiz et Par. 



St. Thomas (DC. Prod. 1. c. 434). 



807. P. polystachya, Miq. 



Fl. Dec-Jan. Stem and lower surface of the leaves reddish. Among 

 rocks in forests, not uncommon, gregarious. All islands. 



B. GYMNOSPERM^E. 



CTCADACEiE. 



[Cultivated in gardens occurs Cycas revoluta, Thunb. (v. Sago Palm).] 



CONIFERJE. 



[Cultivated in gardens occur several species of Thuja.] 



C. MONOCOTYLEDONES. 



AEISMACE^E. 



808. Echinodorus cordifolius, Gris. 



Fl. April-Aug. Flower expanded only till 10 A. M. Leaves hetero- 

 morphous, the primordial ones submerged, linear-lanceolate, passing 

 by degrees into the ordinary eraersed ones. In rivulets, here and there. 

 St. Croix (King's Hill Gut, Armas Hope Gut). 



HYDROCHABIDACEJ;, L. C. Rich. 



809. Thalassia testudinum, Solander (Koenig). 



Not seen flowering. Gregarious in shallow sea- water, very common. 

 All islands. 



POTAME.E, Juss. 



810. Cymodocea manatorum, Ascherson (Naturf. Freunde in Berlin, Jun. Oct., 



1868). 



Not seen flowering, gregarious on the bottom of the sea ; mostly in 

 shallow water. All islands. 



811. Halodule Wrightii, Ascliers. (1. c, and Neumayers Anleit. zur wiss. Beob. 



auf Reisen). 



St. Thomas (Krebs sec. Aschers.). 

 Bull. Nat. Mus. No. 13 7 



