

OPUNTIA. 



139 



Kerrville 



Distribution: Kerr 



Illustrations: Contr. U. S. Nat. Herb. 13: pi. 67; Plant World 19: 142. f. i; 



2, the last as O. macrorhiza. 



Fieure i?^ is from 



H3- 



f 



near Kerrville, Texas. 



Fig. 175. — Opuntia tnackeiiseiibii 



37. Opuntia tenuispina Engelmann, Proc. Amer. Acad. 3: 294. 1856. 



Opufilia minor C. Mueller in Walpers, Ann. Bot. 5: 50. 1858. 



Low and spreading, but becoming 3 dm. high; joints obovate, attenuate at base, 7 to 15 cm. 

 long, light green; leaves very slender, 4 mm. long or less; spines i to 3 from an areole, slender, usually 

 white but sometimes brownish, 3 to 5 cm. long, the upper spines erect or spreading; glochids brown; 

 flowers yellow, 6 to 7.5 cm. broad; ovary with numerous areoles filled with brown wool and brown 

 glochids; fruit oblong, 2.5 to 4 cm. long, with a deep umbilicus; seeds 4 mm. broad or less, very 

 irregular. 



Type locality: 



El 



Dist 



apparently extending to Arizona. 



Engelmann S£ 

 from the latter by 

 resemble O. iyhaea 



Southwestern Texas and adjacent parts of Mexico and New Mexico, 



Cultivated plants and herbarium specimens closely 



Exp 



Plate XXIII, figure 3, represents a joint of the plant collected by Dr. Rose near El 



Texas 



Series 1 1 . PHAEACANTHAE. 



^1 



Bushy or depressed species, with relatively large, flat, persistent joints, the subulate, usually 

 stout spines brown at least at the base, or in some species nearly white. The series is composed of 

 about fifteen species, natives of the south central and southwestern United States, northern and 

 central Mexico. 



