This section is from the book "An Illustrated Flora Of The Northern United States, Canada And The British Possessions Vol2", by Nathaniel Lord Britton, Addison Brown. Also available from Amazon: An Illustrated Flora of the Northern United States, Canada and the British Possessions. 3 Volume Set..
Malva triangulata Leavenw. Am. Journ. Sci. 7: 62. 1824.
Perennial, erect or ascending from a deep root, 1 1/2°-2 1/2° high, branched above, stellate-pubescent with short hairs. Leaves triangular-hastate, the lower long-petioled, crenate or slightly lobed, acute or obtusish, 2'-3' long, the upper short-petioled or nearly sessile, smaller, 3-5-cleft or divided, the lobes narrow, dentate or crenate; flowers in terminal panicled clusters, 1'-2' broad, short-pedicelled, deep purple; in-volucel of 3 linear or spatulate bractlets, nearly as long as the 5-lobed calyx; carpels numerous, hairv. not rugose, short-beaked.
Callirhoë Bushii Fernald, of the Ozark Mountains, Missouri, has palmatifid leaves similar to those of the following species, but with broader segments; it is described as erect, and its bractlets as ovate, but a specimen examined has an ascending stem and linear bractlets.
Malva involucrata T. & G, Fl. N. A. 1: 226. 1838.
Callirhoë involucrata A. Gray, Mem. Am. Acad. (II.) 4: 16. 1848.
Perennial, branched from a deep root, procumbent or ascending, 1°-2° long, pubescent with long hispid hairs. Leaves cordate-orbicular, palmately lobed or palmatifid, the lobes obtuse or acute, dentate or incised, those of the upper leaves commonly narrower than those of the lower; stipules ovate, conspicuous; peduncles terminal and axillary, slender, I-flowered; bractlets of the invol-ucel 3, linear, half the length of the lanceolate acute 3-5-nerved calyx-lobes; flowers red-purple, l'-2 1/2" broad; carpels rugose-reticulate.
In dry soil, Minnesota and Iowa to Texas, Utah and New Mexico and northern Mexico. April-Aug.