5 64 Britton: Studies of West Indian plants 



Type locality : British Islands of America. 



Distribution : Jamaica. 



Harrisia gracilis has been illustrated as follows : Trew, PL 

 Select.//. 14.; Bot. Reg. pi. jj6, as Cactus repandus ; DC. Mem. 

 Mus. Paris 17 : pi. j, as Cereus repandus. 



5. Harrisia Nashii sp. nov. 



Branches widely divergent, light green, 3-4 cm. thick, 9-1 1- 

 ribbed, the ribs rounded. Areoles 2-2.5 cm. apart; spines only 

 3-6, gray, the longer ones 1 5 mm. long ; bud narrowly obovoid, 

 obtuse, very short-pointed, its scales with many curled white hairs 

 6 mm. long or less ; corolla 1.6 dm. long ; scales of the corolla- 

 tube linear, acuminate, 1.5 cm. long, bearing a few hairs; fruit 

 ellipsoid, 6-8 cm. long. 4-5 cm. thick, very strongly tubercled, 

 the conic tubercles 6-8 mm. high. 



Description from N. Y. B. G. no. 24089, collected between 

 Gonaives and Plaisance in Haiti by G. V. Nash and Norman 

 Taylor (no. 176s), in 1905. 



Illustration : PDescour. Fl. Med. Ant. I : pi. 66, as Cactus 

 divaricatus. 



6. Harrisia undata (PfeifT) 



Cereus undatns PfeifT. Enum. Cact. 94. 1837. 



Plant branched, about 2 m. high, the older branches light 

 green, 10-ribbed, the ribs rounded, the depressions between them 

 shallow ; young branches dark green, only about 2 cm. thick. 

 Areoles only 1 cm. apart; spines 12-15, gray, the longer ones 

 only 1 cm. long ; bud small, ovoid, short-pointed, its scales witn 

 few somewhat curled hairs 4-6 mm. long ; flower (according to 

 Pfeiffer and Otto) about 1.5 dm. long, the tube green, covered with 

 acute loosely woolly scales, the petals white, denticulate. 



Description from N. Y. B. G. no. 19263, obtained by N. k 

 Britton from the Havana Botanic Garden in 1903 {no. 502), an 

 determined as Cereus undatns PfeifT. by the description. 



Distribution : Cuba. 



Illustration : Pfeifif. & Otto, Abb. u. Beschr. Cact. pi- *3* 

 which shows the areoles farther apart than they are in our living 

 plants. 



7. Harrisia Brookii sp. nov. 



Plant 5 m. high, much branched, light green ; branch , eS n l" s - 

 cm. thick, 10-ribbed, the ribs very prominent, with deep dep ^ 

 sions between them. Areoles about 2 cm. apart ; spines 9- 



