564 Britton : Studies of West Indian plants 



Type locality : British Islands of America. 



Distribution : Jamaica. 



Harrisia gracilis has been illustrated as follows : Trew, PI. 

 Select.//. /./ / Bot. Reg. //. ^7(5, as CactJis repandus ; DC. Mem. 

 Mus. Paris 17 : pi. 3, as Cere us repaiidiis. 



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 15 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 ^^w 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. 24.08^, collected between 

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

 Taylor [no. 1763), in 1905. 



Illustration: ?Descour. Fl. Med. Ant. i : //. 66, as Cactus 



divaricatus. 



6. Harrisia undata (Pfeiff.) 



Cereus undatus Pfeiff. Enum. Cact. 94. 1837. 



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

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

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

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

 only I cm. long ; bud small, ovoid, short-pointed, its scales with 

 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. 1^263, obtained by N. L. 

 Britton from the Havana Botanic Garden in 1903 {no. 302), and 

 determined as Cereus undatus Pfeiff. by the description. 



Distribution : Cuba. 



Illustration : Pfeiff. & Otto, Abb. u. Beschr. Cact. //. 23, 

 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 ; branches 3-4 

 cm. thick, lo-ribbed, the ribs very prominent, with deep depres- 

 sions between them. Areoles about 2 cm. apart; spines 9-12, 



