366 MISC. PUBLICATION 243, U.S. DEPT. OF AGRICULTURE 
VirGIN Isuanps: St. Thomas, Raunkiaer 634. 
LEEWARD Istanps: Antigua, Wullschlaegel 634; Bor 104. Barbuda, 
Danforth 7. Guadeloupe, Stehlé 197. 
9. Cenchrus tribuloides L., Sp. Pl. 1050. 1753. Virginia. 
DUNE SANDBUR. 
Plants annual, very leafy; culms stout, at first erect, soon branching 
and becoming radiate- decumbent, 15 to "60 em long, the ends ascend- 
ing, rooting “at the nodes and with numerous ascending branches 
10 to 30 cm tall; sheaths usually overlapping, sharply keeled, those 
below the spikes ‘inflated: spikes numerous, 3 to 9 cm long, the burs 
crowded; burs 5 to 6 mm wide, 8 to9 mm high (excluding the spines), 
usually conspicuously villous, but sometimes short-pubescent only, the 
base puberulent; spines finally spreading, flat, the lowermost relatively 
short and slender, the upper broadened at the base, sometimes as much 
as 8 mm broad, some of these 5 to 8 mm long, long-villous on the inner 
face ma of the broad base; spikelets usually 2, 7 to 8 mm long 
(fig. 338). 
In loose sands of the coast, eastern United States and the West 
Indies, and Brazil. 
BeRMuDA: Collins 143; Brown and Britton 128. 
Bauamas: Nassau, collector unknown. Andros Island, Small and 
Carter 8972. Water Key, Wilson 8151. Anguilla Isles, Walson 
7936. 
Cupa: Habana, Léon 5634. Cayo Sabinal, Shafer 700. Cayo 
Paredon Grande, Shafer 2737. 
Cayman Istanps: Grand Cayman, Millspaugh 1249. Cayman 
Brac, Millspaugh 1162. 
Harti: Port-de-Pai, Ekman H 3941. Gonaive Island, Kyerdam 88. 
Purerto Rico: Arecibo, Chase 6561. Aguadilla, Chase 6604. 
Cabo Rojo, Sintenis 29b. Cayo Muertos, Britton, Cowell, and Brown 
5046. Mona Island, Hess440. Vieques Island, Chase 6696. 
96. OLYRA L., Syst. Nat. ed. 10. 2: 1261. 1759 
Plants monoecious; inflorescence paniculate; pistillate spikelets 
borne on the upper branches and on the ends of the lower branches of 
loose terminal panicles, the smaller staminate spikelets pedicellate 
along the lower branches; pistillate spikelets rather large; first glume 
wanting; second glume and sterile lemma herbaceous, caudate- 
acuminate; fruit bony-indurate; staminate spikelets readily decidu- 
ous; glumes and sterile lemma wanting, the lemma and palea mem- 
Loses Erect or clambering often woody perennials with broad 
ades. 
Fruit smooth and shining; plants usually more than 3 m tall. 
. QO. LATIFOLIA. 
Fruit clothed with thick silky hairs at base and summit; plants less than 1 m 
Gals Eo Se ee See 2) oe eg eed ee 2. O. CILIATIFOLIA. 
1. Olyra latifolia L., Syst. Nat. ed. 10. 2: 1261. 1759. Jamaica. 
Olyra paniculata Swartz, Prodr. Veg. Ind. Oce.21. 1788. Jamaica. 
Olyra arundinacea H. B. K., Nov. Gen. et Sp. 1: 197. 1816. 
Colombia. 
Olyra latifolia var. arundinacea Griseb., Fl]. Brit. W.Ind. 535. 1864. 
