UTAHIA. 



215 



Plate xxiii, figure 3, shows a fruit and figure 4 a seed from a specimen collected by 

 Ivar Tidestrom in Goldfield, Nevada, June 1919. Figure 224 shows the plant from which 

 the fruit and seed were obtained. 



28. UTAHIA gen. nov. 



A small globose cactus, prominently ribbed, the ribs tubercled, the areoles felted and bearing 

 several subulate spines ; flowers small, nearly rotate, yellow, borne at the areoles of the upper part 

 of the plant; ovary and perianth-tube densely covered with dry imbricated fimbriate-lacerate scales; 

 perianth-segments short, narrow. 



Type species: Echinocactus sileri Engelmann. 



Named with reference to its type locality in the state of Utah. A monotypic genus. 



1. Utahia sileri (Engelmann). 



Echinocactus sileri Engelmann in Coulter, Contr. U. S. Nat. Herb. 3: 376. 1896. 



Globose, 10 cm. in diameter; ribs 13 to 16, prominent, densely crowded, with short rhombic- 

 angled tubercles; radial spines 11 to 15, stiff, white; central spines 3 or 4, black with pale base, most 

 of them curved upward, 18 mm. long, the upper one slightly longer, the lower ones sometimes 

 stouter and porrect; flowers scarcely 2.5 cm. long; fruit unknown. 



Fig. 



225- 



Fig. 226. 



Fig. 225. Flower o. Utahia sileri. x 1.5. 



Fig. 226. Flower-scale of Utahia sileri. x 6. 



Fig. 227. Spine-cluster of Utahia sileri. Natural size. 



Fig. 227. 



Type locality: Cottonwood Springs and Pipe Springs, southern Utah. 



Distribution: Southern Utah. 



Through the kindness of Dr. J. M. Greenman, we have studied the type specimen of 

 this rare plant, preserved in the herbarium of the Missouri Botanical Garden. Flowers, 

 of some other cactus have been erroneously identified as of this species in other collections, 

 but so far as we are aware this plant is known only from the type specimen. 



Illustration: Schumann, Gesamtb. Kakteen f. 61, A, as Echinocactus sileri. 



Figure 225 shows the outside of a flower cut on one side and spread out; it also shows 

 the origin of the flower at the young spine-areole ; figure 226 shows a flower-scale, enlarged; 

 figure 227 shows a spine-cluster. 



