FLORA OF ST. CROIX AND THE VIRGIN ISLANDS. 97 



805. P. obtusifolia, Cas. DC, Diotr., Miq. a) aud P) clusiaefolia. 



n. April-July. On rocks and nnder sliady trees in leaf-niOTild. Gre- 

 garious, not uncommon, u) all islands ; ii) St. Tliomas (Crown). 



806. P. scandens, Ruiz ot Pa v. 



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^. 



CYCADACEiE. 



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



COIVIFEK^. 



[Cultivated in gardens occur several species of Thuja.] 



C. MONOCOTYLEDONES. 



AEISMACE^. 



808. Echinodorus cordifolius, Gris. 



n. Ai^ril-Aug. Flower expanded only till 10 A. M. Leaves hetero- 

 morphous, the primordial ones submerged, linear-lanceolate, x^assing 

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

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



HY^DROCIIARIDACE^, L. C. Rich. 



809. Thalassia testudinum, Solandor (Koenig). 



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

 All islands. 



POTAME.E, .luss. 



810. Cymodocea manatorum, Asclicrson (Natnrf. Fiviindc in Berlin, ,Tun. — Oct., 



ldG8). 



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

 shallow water. — All islands. 



811. Halodule Wrightii, Ascbers. (1. c, and Ncnniaycrs Auleit. zur wiss. Beob. 



anf Re i sen). 



St. Thomas (Krebs sec. Aschers.). 

 Bull. Xat. Mus. No. 13 7 



