Page:Memoir of a tour to northern Mexico.djvu/105

Rh cultivation; but have not seen as yet flowers or fruit from any of them; still they cannot but belong to my genus Echinocereus, to judge from analogy.

Some Mammillariae of Cosihuiriachi are distinguished by their compact shape; the tuberclestubercules [sic] are very short, globose, or even hemispherical, the spines strong, numerous, radiating, and ad pressed, the fruits central from a woolly vertex: Mammillaria compacta. Another, M. gummifera, belongs together with two species from Texas, and from the mouth of the Rio Grande to the section Angulares, with pyramidal 4 angled tubercles, and milky juice, which, hardening, forms a gum. A third species belongs to Crinitae, and is a most elegant little plant with numerous hairlike radiating and one stout, hooked central spine; I have named it M. barbata.