Shrub; leaves obovate, toothed;sepals white, showy; petal white, clawed; stigma 3-lobed.

This plant keyed to C. greggii.

Sub-shrub; leaves indistinctly lobed, hairy, linear; heads solitary, radiate, paleate; rays white, purple-streaked undernearth; disk flowers yellow, pappus none.

Tree; stems round, striated, spine-tipped; leaves alternate, scale-like; fruit a dehiscent capsule.

Shrub; leaves alternate, lanceolate, margin toothed, spinulose, glandular; phyllaries striate, acuminate; heads discoid; pappus capillary bristles, barbellulate.

Growing on valley floor.

Anthers attached to corolla.

Herbaceous; stem reddish; leaves glabrous, petiolate and toothed below, clasping and entire above; phyllaries glabrous, linear, black tipped; calyculi minute.

Annual; stem internode glutinous; basal leaves oblanceolate; stem leaves linear oblanceolate; calyx campanulate; corolla white with lavender tips, tip lobes 2.

Perennial herb; hairs non-glandular; leaves cordate, irregularly toothed; corolla yellow, lobes 12mm.

Annual; lower stems sparsely retrorsely-hairy; leaves stiff-hairy, finely divided; fruit spines barbed.

Annual; leaves opposite below, alternate above, whorled below inflorescence; cyathia densely appressed-puberulent.

Annual; stem coursely long-hairy; leaflets glabrous above, sparsely hairy below; fruit generally 13mm.

Stem and leaves glandular-hairy.

Perennial; basal and cauline leaves, adaxial surface hairy; lemma 3-awned; one floret per spikelet.

Glumes 0.5mm, lemma awns 1, single floret per spikelet.