6 4 



THE CACTACEAE. 



Figure 92 shows a flower collected 

 by Dr. Rose below Arequipa, Peru, in 

 19 14; figure 93 shows the young fruit 

 and persistent withering perianth from 

 the same plant; figure 94 is from a 

 photograph taken by T. A. Corry near 

 Arequipa, Peru, in 191 7; the plant 

 immediately in front is Trichocereus 

 fascicularis. 



Fig. 92.— 'Flower of Browningia candelaris. 

 Fig. 93. — Young fruit of same. Xo.6. 



X0.6. 



Fig. 94. — Browningia candelaris, with Trichocereus fascicularis 

 immediately in front of it. 



6. STETSONIA gen. nov. 



A tall, erect, much branched cactus, with strongly ribbed branches, the areoles felted and 

 bearing several unequal stiff subulate spines; flowers funnelform, large, solitary at upper areoles; 

 ovary oblong-globose, densely covered by small, broad, erose, ciliate, abruptly subulate-tipped, 

 membranous scales; flower-tube cylindric, somewhat expanded above, bearing distant scales similar 

 to those of the ovary; outer perianth-segments broad, green, obtuse, the inner oblong-oblanceolate, 

 spreading, acute; stamens numerous, not exserted; anthers large, oblong; style rather stout; stigma- 

 lobes many, linear. 



Only the following species is known to us, a conspicuous plant of the Argentine deserts. 

 The genus is dedicated to Francis Lynde Stetson, of New York. 



1. Stetsonia coryne (Salm-Dyck). 



Cereus coryne Salm-Dyck,* Cact. Hort. Dyck. 1849. 205. 1850. 

 Plants large and massive, 5 to 8 meters high, with a thick, short trunk up to 4 dm. in diameter 

 and 4 to 6 dm. long, and many (100 or more) ascending or upright elongated branches; ribs 8 or 9, 

 1 to 1.5 cm. high, obtuse, more or less crenate; spines 7 to 9, unequal, the longest 5 cm. long, subulate; 

 flowers 12 to 15 cm. long; inner perianth-segments white, spreading; fruit not known. 



Type locality: Not cited. 

 Distribution: Northwestern Argentina. 



Although this species has long been known in collections, it is usually represented by 

 very small specimens and has been poorly described. 



*Both Weber and Schumann make Otto the author of this name. Salm-Dyck credits it to the Berlin Gardens. 



