66 the; cactaceae. 



longer than the others, somewhat flattened, sometimes 7 cm. long, all light colored; flowers borne 

 near the ends of the branches, including the ovary about 3 cm. long; inner perianth-segments 

 yellow, acuminate; scales on ovary and flower-tube arranged in many overlapping series, ovate, 8 

 to 15 mm. long; fruit glabrous, about 5 cm. in diameter, scaly, edible. 



Type locality: Mexico. 



Distribution: Southern Mexico. 



The ripe fruit is sold in the market at Tehuacan 

 under the name of geotilla or chiotilla and tuna. Dr. 

 H. H. Rusby reports that the dried fruit, which tastes 

 like gooseberries, is also sold in the markets. ,, , 



This species was collected by Dr. A. Weber while ' 



connected with the French army in Mexico. Material 



was sent to Dr. Kngelmann in 1864, but it was not Y^%^1 V^f^-Jl 



described by him. 



Illustrations: Bull. Soc. Acclim. France 52 : f . 5 ; 

 Mollers Deutsche Gart. Zeit.20 : 445, as Cereus chiotilla; Frc. 9 7.-Fiower of Escontria chiotilla. X0.7. 



_;.,«-,, „ - 7 V. . , Fig. 98. — Fruit of same. X0.7. 



Contr. U. S. Nat. Herb. 10: pi. 43, f. A; 12: pi. 65. 



Plate x is from a photograph taken by Dr. MacDougal at Tomellin, Mexico, in 1906. 

 Figure 97 shows a flower and figure 98 a fruit collected in 1905 by Dr. Rose near Tehuacan. 



8. CORRYOCACTUS gen. nov. 



Stems columnar, usually very short, branching from the base, the branches stiff, more or less 

 erect, strongly ribbed; areoles very spiny; flowers diurnal (?), rather large, with a broad, open throat, 

 the tube proper very short; perianth-segments yellow or orange; filaments numerous, stiff, short, 

 scattered all over the throat, much shorter than the segments; style short and stiff, with numerous 

 stigma-lobes; ovary and flower- tube bearing numerous conspicuous areoles with brown or black 

 wool and subtended by minute scales; fruit juicy, globular, covered with clusters of deciduous 

 acicular spines; seeds small. 



Type species: Cereus brevistylus Schumann. 



A genus of three known species of similar habit and flowers, natives of Peru and 

 Bolivia. The flowers have very short tubes, but are quite different from those of Eulychnia, 

 to which Berger referred the only species he knew. 



While the species are similar in a general way, they are individually different in habit, 

 armament, and in shades of color and size of the flowers; their ranges do not overlap, as 

 they are found in different regions and at different altitudes. One of them occurs in the 

 coastal mountains of southern Peru, altitude 550 meters; one in the foothills of the Andes 

 proper, altitude 2,300 meters; and one in the great valley of the Andes in Bolivia, altitude 

 3,650 meters. 



The genus is named for T. A. Corry, chief engineer of the Ferrocarril del Sur of the 

 Peruvian Corporation, who much facilitated our exploration of this region. It is rather 

 remarkable that all three of these species are found along this very interesting railroad, 

 which extends from the sea-level to an altitude of 16,000 feet. 



Key to Species. 



Flowers very broad, 10 cm. wide, yellow 1. C. brevistylus 



Flowers much narrower than the last, 4 to 7 cm. broad. 



Inner perianth-segments orange; longest spines 10 to 16 cm. long 2. C. brachypetalus 



Inner perianth-segments yellow; longest spines 5 to 7 cm. long 3. C. melanotrichus 



1. Corryocactus brevistylus (Schumann). 



Cereus brevistylus Schumann in Vaupel, Bot. Jahrb. Engler 50: Beibl. m : 17. 1913- 



Plants 2 to 3 meters high, usually much branched from the base, often forming large clumps, 

 light green to almost yellow; ribs few, 6 or 7, very prominent; areoles 3 cm. apart, large, circular 

 and elevated, with short, dense wool and spines; spines about 15, at first brownish, very unequal, 



