Flora of North America species comparison

Triteleia hyacinthina is one of the most widely distributed members of the genus, common in low, moist places such as meadows, vernal pools, and along streams, and found occasionally in drier valley grasslands, foothill woodlands, and closed-cone pine forests. It is cytologically and morphologically variable, with large-flowered forms found in wet places; smaller, scabrous forms found in dry places; forms with rather long pedicels (sometimes recognized as var. lactea); and forms with filaments lacking dilated triangular bases. Most plants have white flowers, but a few interesting forms with restricted distributions have lilac, blue, or even purple flowers. Triteleia ×versicolor Hoover is a sterile hybrid of T. ixioides and T. hyacinthina found in Monterey. Triteleia lilacina is recognized here as a species distinct from T. hyacinthina because of its different base chromosome number (2n = 16) and presence of hyaline vesicles (R. F. Hoover 1955).

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Triteleia grandiflora is the type species of the genus and, along with T. hyacinthina, is its most widely distributed member. Found throughout the region between the Cascade Range and the northern Rocky Mountains, in sagebrush steppe and adjacent woodlands, it is easily recognized by the shape of the perianth, which is rounded at the base instead of tapered as in other Triteleia species.

M. E. Barkworth (1975, 1977) studied variation within Triteleia grandiflora in relation to ploidy level. Polyploid plants are larger, flower later, and have more effective vegetative reproduction by cormlets and contractile roots than their diploid progenitors.

Plants of Triteleia grandiflora from the area west of the Cascade Range and extending into the Columbia River valley and the Klamath Lake region that have been distinguished as var. howellii differ from others of the species only in the shape of the filaments. L. Abrams and R. S. Ferris (1923–1960, vol. 1) used relative perianth length as a key character, but this is not consistent (R. F. Hoover 1941), and several specimens from the part of the Columbia River valley where both filament morphologies occur appear to represent intergrades (R. F. Hoover 1955). Thus it seems inadvisable to recognize infraspecific taxa. Plants assignable to var. howellii have not been found in California or southwestern Oregon in recent decades, and may be extirpated there.

Triteleia bicolor is merely a color form having a perianth with a blue tube and white lobe.

(Discussion copyrighted by Flora of North America; reprinted with permission.)