Euchiton sphaericus |
Euchiton |
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globe cotton-leaf, star-cudweed, tropical creeping cudweed |
cottonleaf, cudweed, euchiton |
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Habit | Annuals, 5–80 cm; taprooted; stolons absent. | Annuals or perennials, 5–80 cm (usually fibrous-rooted, sometimes rhizomatous, usually stoloniferous). | ||||||||
Aerial stems | simple or branched from bases (sometimes branched from leaf axils), thinly and persistently white-tomentose. |
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Stems | usually 1, erect. |
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Leaves | basal and proximal cauline withering before flowering (blades 1-nerved, oblanceolate to spatulate); cauline 8–12, blades linear, 2–4 cm × 1–2 mm (largest at midstem), bases not clasping, margins revolute, sometimes undulate, abaxial faces white, tomentose, adaxial faces green, glabrous. |
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. |
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Bracts | subtending heads 4–8, 10–30 mm, surpassing heads. |
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Involucres | 3.5–4 mm. |
narrowly campanulate to cylindric, 3–5 mm. |
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Receptacles | flat, smooth, epaleate. |
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Pistillate florets | 16–26. |
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Peripheral (pistillate) florets | 16–150 (more numerous than bisexual); corollas purple or distally purplish. |
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Bisexual florets | 1. |
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Phyllaries | brownish to tawny, sometimes purple-tinged (shiny), elliptic-lanceolate, apices acute. |
in 3–4+ series, mostly stramineous to brownish, sometimes purplish to pinkish (hyaline, stereomes not glandular), unequal, chartaceous toward tips. |
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Heads | in globose clusters 10–20 mm diam. |
disciform, usually in terminal clusters (subtended by leafy bracts, sometimes with axillary clusters), rarely borne singly. |
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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. |
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Pappus | bristles distinct or basally coherent (falling in groups). |
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Inner | (bisexual) florets 1–7; corollas purple or distally purplish. |
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x | = 14. |
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2n | = 28. |
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Euchiton sphaericus |
Euchiton |
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Phenology | Flowering Jul–Oct. | |||||||||
Habitat | Grassy open places in wooded areas, disturbed soils, recent clearings | |||||||||
Elevation | 30–700 m (100–2300 ft) | |||||||||
Distribution |
CA; OR; se Asia; Pacific Islands (Hawaii, New Guinea, New Zealand); Australia [Introduced in North America]
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Australia; New Zealand; New Guinea; e Asia; some species widely naturalized [Introduced in North America] |
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Discussion | In California and Hawaii, plants of Euchiton sphaericus have been identified as Gnaphalium japonicum; annual duration, slender taproots, non-clasping leaf bases, and single bisexual florets establish the correct identity of E. sphaericus. It “varies enormously in length, position and degree of branching, and the branches may be either vegetative or flower-bearing” (D. G. Drury 1972). (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Species 17 (3 in the flora). (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Key |
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Source | FNA vol. 19, p. 441. | FNA vol. 19, p. 440. | ||||||||
Parent taxa | Asteraceae > tribe Gnaphalieae > Euchiton | Asteraceae > tribe Gnaphalieae | ||||||||
Sibling taxa | ||||||||||
Subordinate taxa | ||||||||||
Synonyms | Gnaphalium sphaericum | |||||||||
Name authority | (Willdenow) Anderberg: Opera Bot. 104: 167. (1991) | Cassini: in F. Cuvier, Dict. Sci. Nat. ed. 2, 56: 214. (1828) | ||||||||
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