lO-n.i THE CACTI OF TRINIDAD. 85 



flowers, but Mr. Freeman caught sight of a bud. Complete botanical 

 specimens showing flowers and fruit and notes upon them are desiderata. , 

 The species is otherwise known from the northern coast of Venezuela, \ 

 where it was collected by Dr. J. N. Rose and Major Cornelius C. Smith, 

 U.S. Ai-my, in October, 1916. When flowers of the Patos plant are 

 obtained tliey may be found to be somewhat smaller than specimens from 

 Venezuela. We have included this species in the genus Ceplialocereu^i 

 with considerable hesitation ; it is more slender and weaker than most 

 species of the genus and its imperfectly known flowers indicate that it 

 may be generically distinct. 



8. AcanthocereuS pentagonus (L.) Brilton and Rose [Cactus 2''ehfii- 

 ijoiui.s L. : Ctreu-'i haxanienn>< Karw.] 



The Arching Acanthocereus, despite its oldest name poitajonus, 

 usually has three-angled leafless stems and branches ; occasionally they 

 are four-angled, rarely five-angled, but seedlings and young plants 

 are con:imonly five-angled. Its branches are rather weak, arching or 

 clambering, sometimes forming thickets or large colonies by rooting at 

 the tips where these come to the ground, but the joints do not emit 

 aerial root?. The sides of the joints are from an inch to about three 

 inches wide, the ribs low-crenate, the areoles rather widely separated, 

 bearing several green subulate or acicular spines Iialf an inch to about 

 two inches long, on old stems somctuncs longer. The funnelform flowers 

 are from five inches to eight inches long, borne one at an areole, 

 toward the ends of the branches ; the areoles of the ovary and flower- 

 tube sometimes bear short acicular spines; the segments of the perianth 

 are acmninate, the outer green, the inner white. The fruit is obloni;, 

 red and edible. 



This cactus occurs frequently on Gasparee, Chacachacare and Patos 

 Islands; we found it in bloom on Chacachacare on April 13. It probably 

 grows on Monos also, but I did not see it there, nor on the Trinidad 

 mainland. The species has a wide distribution, x-anging naturally north 

 in the Lesser Antilles to Guadeloupe and naturalized on St. Croix and 

 St. Thomas ; on the continental coasts it extends from Venezuela to 

 Guatemala and southern Texas ; it is abundant on the Keys of Florida 

 and is recorded from Cuba. Races differ in size of stems, size of flowers 

 and in armament. 



9. LeniaireOCereUS griseUS (Hawonh) BriUon ami Rose [Ctreus 

 iiriseuH Ha worth ; Cerfiii-'! chunienfi Salni-Dyck.] 



Known in Curacao as Daatoe, we have found no English name for 

 this large columnar-branched cactus, which grows abundantly on Patos, 

 where I studied it with IMr. h'reeman on March Ri, 1920, finding it 

 bearing both flowers and fruit. The plant reaches a height of some 

 twenty-five feet, the short trunk often a foot or more in diameter, the 

 usually numerous leafless branche-; nearly upright, dark green or 

 somewhat glaucous, 8-ribbed to lO-ribbed, and from three to five inches 

 in diameter ; the areoles ai-e ratlur close together on the ribs and bear 

 several slender, grey spines up to about one and a half inches long, 

 the armament being formidable. Its flowers, borne singly at areoles 

 mostly high up, are short-funnelforai, pinkish, a little less than three 

 nches long, the thinner segments nearly white ; the ovary bears numerous 



