FLORA. OF ST. CROIX AND THE VIRGIN ISLANDS. 97 



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



Fl. Apiil-Jiily. On rocks aud under shady trees in leaf-mould. Gre- 

 garious, not uncommon, a) all islands ; /5) St. Thomas (Crown). 



806. P. scandens, Rui^ ct Pav. 



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^. 



CTCADACEiE. 



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



CONIFERS. 



[Cultivated in gardens occur several species of Thuja.] 



C. MONOCOTYLEDONES. 



AEISMACE^. 



808. Echinodorus cordifolius, Gris. 



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

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

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

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



HYI>ROCHARI»ACEJE, L. C. Rich. 



809. Thalassia testudinum, Solaudor (Koenig), 



Xot seen flowering. Gregarious in shallow sea- water, very common. — 

 All islands. 



POTAJTIE.E, Juss. 



810. Cymodocea manatorum, Asclierson (Naturf. Frenndc in Beiliu, Jan. — Oct., 



1868). 



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

 shallow water. — All islands. 



811. Halodiile Wrightii, Ascliers. (1. c, and Neumayers Auleit. zur wiss. Beob. 



auf Re i sen). 



St. Thomas (Krebs sec. Aschers.). 

 Bull. Nat. Mus. Xo. 13 7 



