504 Britton : Studies of West Indian plants" 



Type locality : British Islands of America. 



Distribution : Jamaica. 



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

 Select.//. 14 ; Bot. Reg. pi. 33 6, as Cactus repandns ; DC. Mem. 

 Mus. Paris 17 : pi. 3, as Cereus npandus. 



5. Harrisia Nashii sp. no v. 



Branches widely divergent, light green, 3-4 cm. thick, 91 1- 

 ribbed, the ribs rounded. Areoles 22.5 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 few hairs; fruit 

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

 the conic tubercles 68 mm. high. 



Description from N. Y. B. G. no. 24.089, collected between 

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

 Taylor (no. 1763), in 1905. 



Illustration: PDescour. Fl. Med. Ant. 1 : pi. 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, 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 with 

 few somewhat curled hairs 46 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. 10263, 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, 10- ribbed, the ribs very prominent, with deep depres- 

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



