STANDLEY TEEES AND SHRUBS OF MEXICO. 929 



nearly terete, 3 to 5 cm. long ; flower purple, 7.5 cm. broad ; perianth segments 

 nearly oblong; fruit globular, juicy, edible. 



Because of tbe delicious strawberry-like flavor of the fruit, this plant is 

 known in Texas as strawberry cactus. The fruit is eaten raw and also used 

 for making preserves. 



40. EcMnocereus eng'elm.annii (Parry) Riimpler ; Forst. Handb. Cact. ed. 2. 

 805. 18S5. 



Cereus engehnannii Parry, Amer. Journ. Sci. II. 14: 338. 1852. 



Sonora and Baja California. Utah and Arizona to California ; type from 

 San Felipe, California. 



Cespitose, forming large clumps; joints erect or ascending, cylindric, 10 to 

 30 cm. long, 5 to 6 cm. in diameter; ribs 11 to 14, low, obtuse; areoles large, 

 nearly circular ; radial spines about 10, appressed, stiff, about 1 cm. long ; 

 central spines 5 or 6, very stout, more or less curved and twisted, terete or 

 somewhat flattened, sometimes 7 cm. long, yellowish to brown, more or less 

 variegated ; flowers 5 to 8 cm. long, and even broader when fully expanded, 

 purple ; perianth segments oblong, 3 to 4 cm. long, acuminate ; scales on ovary 

 3 to 5 mm. long, acuminate ; areoles felted and bearing stout bristles ; fruit 

 ovoid to oblong, spiny, about 3 cm. long; seeds black, nearly globular, or a 

 little oblique, 1.5 mm. in diameter or less, tuberculate. 



41. Echinocereus sarissophorus Britt. & Rose, Cactaceae 3: 38. 1922. 

 Chihuahua and Coahuila ; type from Saltillo, Coahuila. 



Cespitose ; stems short, thick, pale green, about 10 cm. thick ; ribs 9 ; radial 

 spines 7 to 10, slender ; centrals several, 5 to 8 cm. long, often bluish, somewhat 

 angled; flowers purplish, 7 to 8 cm. long; inner perianth segments broad; 

 areoles on ovary and flower tube bearing short white wool and 3 to 5 long pale 

 bristle-like spines ; fruit globular, 2 to 3 cm. in diameter, covered with clusters 

 of deciduous spines; seeds black. 



42. Echinocereus dubius (Engelm.) Riimpler; Forst. Handb. Cact. ed. 2. 787. 

 1885. 



Cereus dubius Engelm. Proc. Amer. Acad. 3: 282. 1856. 



Western Texas, the type from El Paso ; doubtless also in Chihuahua. 



Somewhat cespitose ; stems 12 to 20 cm. long, pale green, of soft flabby texture, 

 7 to 9-ribbed; ribs broad; spines white; radial spines 5 to 8, 12 to 30 cm. 

 long ; centrals 1 to 4, 3.5 to 7.5 cm. long, angled, often curved ; flowers pale 

 purple, 6 cm. long or more, with rather few and narrow perianth segments; 

 scales on flower tube bearing 1 to 3 white bristles in their axils; fruit very 

 spiny, 2.5 to 3 cm. long; seeds covered with confluent tubercles. 



43. Echinocereus cong'lomeratus Foi'st. Gartenflora 39: 405. 1890. 



Cereus conglomeratus Berger, Rep. Mo. Bot. Gard. 16: 81. 1905. 



Nuevo Le6n, Coahuila, and Zacatecas ; type from Rinconada, near Monter- 

 rey, Nuevo Le6n. 



Cespitose, forming large clumps ; joints simple, often half covered in the 

 ground, 10 to 20 cm. long ; ribs 11 to 13, slightly undulate ; areoles 1 to 1.5 cm. 

 apart, small, circular, slightly felted ; spines white to brownish ; radial spines 

 acicular, 1.5 to 2.5 cm. long, spreading; central spines several, elongate, often 

 7 cm. long, very flexible ; flowers 6 to 7 cm. long, broad and open, purplish ; 

 perianth segments broad, 2 cm. long; spines on ovary and flower long, white, 

 more or less curved ; fruit globular, 3 cm. in diameter, somewhat acid, edible ; 

 seeds numerous. " Pitahaya," " pitahaya de agosto," " alicoche." 



