Euchiton

Cassini in F. Cuvier

in F. Cuvier, Dict. Sci. Nat. ed.2, 56: 214. 1828

Etymology: Greek eu -, good or true, and chiton, tunic, alluding to ‘close-fitting’ clusters of bracts subtending clusters of heads
Found in FNA Volume 19. Treatment on page 440. Mentioned on page 58, 387, 429.
Annuals or perennials, 5–80 cm (usually fibrous-rooted, sometimes rhizomatous, usually stoloniferous). Stems usually 1, erect. Leaves basal and cauline (sometimes in rosettes); alternate; petiolate or sessile; blades oblanceolate, spatulate, lanceolate, or linear, bases cuneate or ampliate, margins entire (sometimes undulate and/or revolute), faces bicolor, abaxial usually silvery, tomentose, adaxial usually green, glabrate or glabrous. Heads disciform, usually in terminal clusters (subtended by leafy bracts, sometimes with axillary clusters), rarely borne singly. Involucres narrowly campanulate to cylindric, 3–5 mm. Phyllaries in 3–4+ series, mostly stramineous to brownish, sometimes purplish to pinkish (hyaline, stereomes not glandular), unequal, chartaceous toward tips. Receptacles flat, smooth, epaleate. Peripheral (pistillate) florets 16–150 (more numerous than bisexual); corollas purple or distally purplish. Inner (bisexual) florets 1–7; corollas purple or distally purplish. Cypselae obovoid-ellipsoid, slightly flattened, faces minutely hairy or papillate (papilliform hairs or papillae ± clavate, not myxogenic); pappi readily falling (singly or in groups), of 12–20, distinct or basally coherent, barbellate bristles in 1 series. x = 14.

Distribution

Introduced; Australia, New Zealand, New Guinea, e Asia, some species widely naturalized.

Discussion

Species 17 (3 in the flora).

Key

1 Annuals; taprooted; leaf bases not clasping; bracts subtending heads 4–8; heads in globose clusters; bisexual florets 1 Euchiton sphaericus
1 Perennials or biennials; fibrous-rooted; leaf bases subclasping; bracts subtending heads 2–5; heads in hemispheric clusters; bisexual florets 3–7 > 2
2 Stolons usually present; basal leaves in rosettes at flowering; cauline leaves 2–4(–6), blades linear to oblanceolate, 1–2 cm × 1–2 mm; bracts subtending heads 2–3, not surpassing heads; pistillate florets 40–60 Euchiton gymnocephalus
2 Stolons usually absent; basal leaves withering before flowering; cauline leaves 6–10, blades mostly linear, 3–8 cm × 2–3 mm; bracts subtending heads 3–5, surpassing heads; pistillate florets 80–150 Euchiton involucratus
Facts about "Euchiton"
AuthorGuy L. Nesom +
EtymologyGreek eu -, good or true, and chiton, tunic, alluding to ‘close-fitting’ clusters of bracts subtending clusters of heads +
IllustratorBarbara Alongi +
Referencenesom2002a +
Taxon nameEuchiton +
Taxon parentAsteraceae tribe Gnaphalieae +
Taxon rankgenus +
VolumeVolume 19 +