60 Field Columbian Museum Botany, Vol. 2. 



Apparently between O. commutata (Muell.) Ktze. and O. tricho- 

 toma (Muell.) Ktze., differing from both in its linear bracts, flat 

 veins, thyrsoid inflorescence, and general characters. 



Flat sandy fields near the coast at Cape Corientes, Cuba (1462). 



Euphorbia buxifolia Lam., Diet, ii; 421. 



A very large number of examples of this species were collected 

 and a still greater number examined in the field, from which the fol- 

 lowing characters are drawn: 



E. glabrata Sw. Prodr. 76, E. littoralis Kth., H. B. K., Nov. Gen. 

 et Sp. ii. 44; E. salina Willd. in Hb., E. mesembrianthemifolia Jacq. 

 Stirp. Am. 151. Suffruticose, glabrous; leaves sarcous, ovate, 

 pointed, entire; lower stipules deltoid, median triangular, those of the 

 apical leaves generally geminate, all more or less fringed or long 

 setose-fimbriate. Involucres few at the apices of the branchlets, 

 turbinate, smooth without and within, glands 4 concave, appendages 

 white, longer than broad, margin entire or tending toward crenation, 

 lobes triangular-truncate, mostly bifid at the apex, the two flanking 

 the sulcus broader and 3-8 fimbriate, fifth gland replaced by a deep 

 sulcus from which rises a long narrow digit-like process of the invol- 

 ucre (false lobe). Seeds 1.4 mm. long, 1.1 mm. broad, ashen, nearly 

 globular, the lateral and dorsal angles being barely raised above the 

 plane of the facets, dorsal facets plainly but slightly transverse anasto- 

 mo-rugose, ventral markings the same but slighter. Shores of islets, 

 Hamilton Bay, Bermuda (6.10). Sea shore at Santurce, Porto Rico 

 * (276); Charlotte Amalia, St. Thomas (494); Ratones Island, Port of 



Ponce (658), and shores of Port of Ponce (670, 671), Porto Rico; east 

 shore of Cozumel Island (1591); shores at Progreso, Yucatan ( 1646); 

 Perez, Allison and Pajaros Islands, Alacran Shoals (1751, 1761), Is ^ e 

 of Pines, Cuba (1432). 



Forma reclinata: Similar to the species but nearly prostrate in 

 habit, with larger and broader leaves, broader blepharose stipules 

 and shorter and denser branchlets. Perez, Pajaros and Allison 

 Islands, Alacran Shoals (1739, 1763, 1769). 



Forma seminuda: Similar to the species but with long, nearly 

 nude, zig-zag stem and branches, internodes 1 to 2 cm. long, branch- 

 lets leafy, stipules as in the previous form but narrower. Perez 

 Island, Alacran Shoals (1738% 1742). 



Forma florida: Similar to the last but with very small leaves on 

 the branchlets which are so densely crowded with flowers and fruits 

 as to appear like capitate clusters protruding from the bare branches. 

 East shores of Cozumel Island (1589); Perez, Chico and Pajaros 

 Islands, Alacran Shoals (1738, 1739, 1747, 1751, 1762). 



Euphorbia buxifolia flexuosa (Kth.) Boiss., in de C. Prod, xv: 15. 



Plant pale green, stems flexuous, with comparatively long inter- 

 nodes. Stipules deltoid broad at the base, shallow-fringed at the 

 apex; leaves oval-oblong or ovate, cordate-auriculate at the base, the 

 majority of them showing a tendency to, or actually slight denticu- 

 late at the apex, barely mucronulate. Involucres sparse, somewhat 



