Echinocactus alamosanus Britton and Rose, Contr. U. S. Nat. Herb. 16: 239. 1913.
Plants usually single, sometimes in clusters, somewhat flattened above, green, 30 cm. in diameter or more; ribs about 20, narrow; spines all yellow; radials usually 8, 3 to 4 cm. long, more or less spreading; central single, porrect or erect, somewhat flattened laterally, 6 cm. long and a little longer than the radials; flower-buds covered with ovate, ciliate scales, these brownish except in the margin; fruit unknown.
Type locality: Alamos Mountain, Mexico.
Distribution: Southern Sonora, Mexico.
This species is quite unlike anything we have yet seen from the west coast of Mexico. A small living plant of the type collection was brought to Washington by Dr. Rose in 1910, but is still quite small, being only 10 cm. in diameter. It has now been sent to Mr. Wm. Hertrich, superintendent of the Huntington Estate near Los Angeles, where it will be planted in the open and given a chance to develop. The illustration cited below was made from this plant.
Mr. Ivan M. Johnston has collected this species or a closely related one on the hill-sides about San Carlos Bay, Sonora (No. 4348). He says that it is 6 dm. high, 5 dm. in diameter and has 23 ribs. He describes the flower as clear lemon-yellow with the outer segments greenish red at tip; the scales on the ovary are broadly ovate, apicular, ciliate.
Illustration: Contr. U. S. Nat. Herb. 16: pl. 66, as Echinocactus alamosanus.
Figure 145 is from a photograph of the living plant collected by Dr. Rose.
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