Gaillardia arizonica |
Gaillardia |
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Arizona blanketflower, Pringle's blanketflower |
blanket-flower, fire wheel, gaillardia |
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Habit | Annuals, 5–40 cm. | Annuals, perennials, or subshrubs, 10–80+ cm (sometimes rhizomatous). | ||||||||||||||||||||||||||||||||||||||||
Stems | usually erect, usually branched (from bases or throughout). |
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Leaves | mostly basal, mostly restricted to proximal 1/5(–1/3+); petiolar bases 0–2+ cm; blades oblanceolate, obovate, or spatulate, 3–6(–9) cm × 5–25 mm, mostly raggedly pinnately lobed, sometimes entire, sparsely to densely villous with jointed hairs. |
basal, basal and cauline, or mostly cauline; alternate; petiolate or sessile; blades mostly elliptic, lanceolate, linear, oblong, obovate, ovate, or spatulate, often pinnately lobed, ultimate margins toothed or entire, faces usually scabrellous to villous (hairs simple or jointed), rarely glabrous, usually notably gland-dotted (except in 10. G. suavis). |
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Peduncles | 5–35 cm. |
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Involucres | hemispheric to nearly rotate, mostly 9–20+ mm diam. |
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Receptacles | convex to hemispheric, smooth or pitted (often with scattered, hard, setiform enations), epaleate. |
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Ray florets | 10–13; corollas yellow to orange, 17–22 mm. |
0, or 5–15+, usually neuter, rarely pistillate and fertile or styliferous and sterile; corollas yellow to white or orange to red, purplish, or brown, often bicolored (sometimes “ray” corollas funnelform, 5-lobed, heads radiant). |
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Disc florets | 40–100+; corollas yellow, tubes 0.6–0.8 mm, throats campanulate, 2.8–3 mm, lobes deltate, 0.5–0.7 mm, jointed hairs to 0.3 mm. |
20–100+, bisexual, fertile; corollas yellow or orange to red, purplish, or brown (distally ± shaggily hairy, hairs jointed), tubes much shorter than ampliate, campanulate to cylindric or urceolate throats, lobes 5, broadly deltate or ovate (± equal, sometimes attenuate or attenuate-terete apically; style-branch apices ± attenuate, usually hispidulous). |
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Phyllaries | 14–20, lanceolate to lance-attenuate, 6–12+ mm, ciliate with jointed hairs. |
persistent, 14–40+ in 2–3+ series (reflexed in fruit, usually distinct, oblanceolate, lanceolate, narrowly triangular, or linear, subequal to unequal, usually chartaceous proximally, distally herbaceous, apices often attenuate). |
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Heads | usually radiate or discoid (sometimes radiant), borne singly. |
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Cypselae | obpyramidal, 2 mm, hairs 2 mm, inserted at bases and on angles and faces; pappi of 8–10 obovate or ovate to lanceolate, aristate or muticous scales 2–5 mm (if aristate, scarious bases 2–3.5 × 1.3–1.6 mm). |
obpyramidal to clavate, ± 4-angled (lengths 1–1.5+ diams.), sparsely to densely hairy (at least proximally, hairs straight); pappi usually persistent, of 6–10+ medially thickened, laterally scarious scales in 1–2 series (all, some, or none aristate), rarely 0. |
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Receptacular | setae 0 or 0.3–0.8 mm. |
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x | = 19. |
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2n | = 34. |
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Gaillardia arizonica |
Gaillardia |
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Phenology | Flowering Mar–May. | |||||||||||||||||||||||||||||||||||||||||
Habitat | Sandy desert washes and fans | |||||||||||||||||||||||||||||||||||||||||
Elevation | 300–1200 m (1000–3900 ft) | |||||||||||||||||||||||||||||||||||||||||
Distribution |
AZ; NV; UT; Mexico (Sonora)
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North America; Mexico; South America (mostly Argentina) |
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Discussion | Species 15–17 or more (11 in the flora). Some horticultural gaillardias may be derived from hybrids (e.g., Gaillardia ×grandiflora van Houtte) involving G. aristata and some other species (probably G. pulchella). Such horticultural plants sometimes persist after cultivation or occur sporadically as waifs in places well beyond the “natural” ranges of the “parent” species; e.g., scattered localities in Arizona and California. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Key |
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Source | FNA vol. 21, p. 426. | FNA vol. 21, p. 421. | ||||||||||||||||||||||||||||||||||||||||
Parent taxa | Asteraceae > tribe Heliantheae > subtribe Gaillardiinae > Gaillardia | Asteraceae > tribe Heliantheae > subtribe Gaillardiinae | ||||||||||||||||||||||||||||||||||||||||
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Synonyms | G. arizonica var. pringlei | |||||||||||||||||||||||||||||||||||||||||
Name authority | A. Gray: in A. Gray et al., Syn. Fl. N. Amer. 1(2): 353. (1884) | Fougeroux: Observ. Phys. 29: 55. 1786 (as Gaillarda): Hist. Acad. Roy. Sci. Mém. Math. Phys. (Paris, 4to) 1786: 5. (1788) | ||||||||||||||||||||||||||||||||||||||||
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