THE CACTACEAE. 



We know the species only from description, from a flower collected by Dr. E- Hassler 

 from the region of the type locality, and from living plants and specimens collected by Dr. 

 Shafer at Posadas, Argentina. It is now grown in the Hanbury Garden at La Mortola, 

 Italy. 



Figure 10 is from a photograph taken by Dr. Shafer at Posadas, Argentina, in 1917. 



8. Cereus xanthocarpus Schumann, Gesamtb. Kakteen Nachtr. 32. 1903. 



Tall, tree-like, up to 6 meters high, somewhat branched, very spiny at apex; ribs of branches 

 4 to 6, high, very narrow; areoles 3 to 4 cm. apart, white- woolly ; spines 3 or 4, short, conic, dark 

 brown; flowers opening at night; flower-tube 12.5 cm. long, yellowish green below, whitish green 

 above ; outer perianth-segments oblong to lanceolate, 4 to 1 2 cm. long, whitish green ; inner perianth- 

 segments white; fruit yellow, oblong, 6.5 to 7 cm. 

 long, the flesh white; seeds 2 mm. long, kidney- 

 shaped. 



Type locality: Calle Manora, Paraguay. 



Distribution: Paraguay. 



We have not seen this species; in its 

 yellow fruit it differs from most other known 

 members of this genus. 



All we know about Cereus coracare Gos- 

 selin is that Hirscht (Monatsschr. Kakteenk. 

 9: 159. 1899) states that Mr. Roland-Gosselin 

 is to be thanked for a splendid fruit of 

 Cereus coracare, which in form and size re- 

 sembles an apple, is of a beautiful color and of 

 excellent taste to eat, and a note of Graebener 

 (Monatsschr. Kakteenk. 12: 174. 1902) that 

 Cereus coracare was from Paraguay and was 

 then 19 cm. high. It may belong here. 



The status of this and the following two 

 species, all from Paraguay, can be determined 

 only by further observations in that region. 



9. Cereus lamprospermus Schumann, Monatsschr. Kakteenk. 9: 166. 1899. 



Tree-like, 6 to 8 meters high, very much branched; branches green, soon erect; ribs 6 to 8, 

 thickish and obtuse, separated by rounded intervals; spines 8 to 11, hardly distinguished as radials 

 and centrals; areoles 2 to 2.5 cm. apart, subulate; flower 15 to 16 cm. long; outer perianth-seg- 

 ments green with reddish tips; stigma-lobes 13; ovary nearly naked; seeds black, shining. 



Type locality: Fuerte Olympo, Paraguay. 

 Distribution: Paraguay. 



10. Cereus pachyrhizus Schumann, Gesamtb. Kakteen Nachtr. 33. 1903. 



Plant upright, 1, or at the most, 3 meters high, with swollen tuberous roots; branches or stem 

 up to 10 cm. thick, rounded at the apex, terminated by large and numerous spines; older joints 

 yellowish brown, younger ones yellowish green, subglaucous; ribs 6, very strongly compressed 

 laterally, up to 1 cm. thick and 5 cm. high, separated by sharp, deep furrows, subsinuate; areoles 

 2.5 to 3 cm. apart, circular, 5 to 6 mm. in diameter, with short felt, which is not curly even when 

 young; spines 10 to 13, poorly differentiated into radial and central ones, one of the latter being 

 longest and up to 3 cm. long; all spines subulate and very sharp; fruit ellipsoid, 5 cm. long, 3 to 4 

 cm. in diameter, naked, smooth; seeds 2.5 mm. long, subcompressed, shining. 



Type locality: Cerro Noaga, Paraguay. 

 Distribution: Paraguay. 



This species is unknown to us, except from the original description. It is recorded as 

 growing on bare, granitic rocks at 350 meters altitude. 



Fig. 10. — Cereus stenogonus. 



