Platyschkuhria integrifolia |
Asteraceae tribe Heliantheae subtribe Chaenactidinae |
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basin daisy, desert basindaisy |
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Habit | Annuals, biennials, perennials, subshrubs, shrubs, or treelets, 1–80(–300) cm (some rhizomatous or with woody caudices). | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Leaves | blades 2–10 cm × 5–35+ mm. |
basal, basal and cauline, or cauline; opposite or alternate; usually petiolate, sometimes sessile; blades mostly cordate, deltate, elliptic, lanceolate, linear, oblanceolate, oblong, obovate, ovate, rhombic, or spatulate, often 1–2-pinnately or -ternately lobed (lobes mostly filiform to linear, lanceolate, or oblanceolate), ultimate margins entire or toothed, faces ± lanate to woolly, or hispidulous to scabrellous or strigose, sometimes glabrescent, sometimes stipitate-glandular, rarely glabrous, often gland-dotted. |
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Involucres | 9–12+ × 12–25+ mm. |
campanulate to narrowly cylindric or obconic, or hemispheric to rotate. |
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Receptacles | conic, flat, or hemispheric, often knobby or pitted (sometimes hairy or gland-dotted), usually epaleate (paleae sometimes subulate scales in Chaenactis; in Bartlettia, linear, membranous, hairy scales, each appressed to and shed with an associated cypsela may be interpreted as paleae). |
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Ray florets | 0 (corollas of peripheral florets sometimes notably larger than those of the inner, then zygomorphic, showy, and somewhat raylike, e.g., Chaenactis spp.) or (1–)4–21(–60+), pistillate, fertile; corollas yellow, orange, red, purplish, or whitish (persistent, marcescent in Arnica dealbata). |
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Disc florets/ |
3–6(–7) mm. |
4–200+, usually bisexual, fertile (functionally staminate in Arnica dealbata); corollas yellow, orange, purplish, or whitish, usually hairy and/or gland-dotted or stipitate-glandular, tubes shorter than to longer than cylindric or campanulate to funnelform throats, lobes 5, deltate to linear; anther thecae pale; stigmatic papillae in 2 lines. |
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Phyllaries | usually persistent, 4–60+ in 1–4+ series (usually erect at flowering, usually reflexed in fruit, usually distinct, basally coherent in some Arnica spp., mostly lance-ovate, linear, or ovate, unequal to subequal, mostly herbaceous to membranous, outer foliaceous in Venegasia). |
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Calyculi | usually 0 (sometimes 1–3 bractlets in Schkuhria). |
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Heads | usually radiate, sometimes discoid, rarely radiant (Chaenactis spp.), borne singly, or in clusters, or in corymbiform, cymiform, or paniculiform arrays. |
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Cypselae | (1–)3–5(–8) mm; pappi 0.6–3+ mm. |
mostly obpyramidal and 4–5-angled, sometimes clavate, columnar, cylindric, or fusiform, sometimes compressed and ± linear (e.g., Chaenactis, Hulsea) or obcompressed (e.g., Arnica dealbata, Bartlettia; lengths usually 3+ times diams.), faces usually hairy and/or gland-dotted; pappi falling, fragile, or persistent, usually of 6–80 distinct or basally connate bristles, or of 4–20 distinct (or basally connate) scales, all, some, or none aristate, sometimes pappi none. |
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Ray | corolla laminae 6–16 mm. |
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2n | = 24, 48, 60, 72. |
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Platyschkuhria integrifolia |
Asteraceae tribe Heliantheae subtribe Chaenactidinae |
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Phenology | Flowering May–Jul. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Habitat | Seleniferous clays, shaley slopes | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Elevation | 1100–2200 m (3600–7200 ft) | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Distribution |
AZ; CO; MT; NM; UT; WY
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North America; Mexico; Central America; South America (Bahia) |
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Discussion | Specimens of Platyschkuhria integrifolia with stems leafy over 3/4+ of their lengths have been called var. oblongifolia (mostly from “four-corners” area of Arizona, Colorado, New Mexico, and Utah). Those with leaves mostly on proximal 1/10–3/4 their stem lengths, peduncles little or not at all stipitate-glandular, and phyllary tips ± caudate have been called var. ourolepis (mostly from Uinta Basin, Utah). Those with leaves mostly on proximal 1/10–3/4 their stem lengths, leaf blades widest beyond their middles and rounded at tips, peduncles ± stipitate-glandular, and phyllary tips acute to acuminate have been called var. nudicaulis (mostly from Montana and Wyoming). Those with leaves mostly on proximal 1/10–3/4 their stem lengths, leaf blades widest proximal to their middles and acute at tips, peduncles ± stipitate-glandular, and phyllary tips obtuse to acute or acuminate have been called var. desertorum (mostly from western Colorado and eastern Utah). (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Genera 25, species 129 (19 genera, 83 species in the flora). The circumscription of Chaenactidinae used here (that of H. Robinson 1981) contrasts sharply with that of B. G. Baldwin (Baldwin and B. L. Wessa 2000; Baldwin et al. 2002). Baldwin included Chaenactis, Dimeresia (here segregated in Dimeresiinae), and Orochaenactis in his Chaenactidinae (as sole subtribe in his Chaenactideae) and placed other genera of Chaenactidinae in the sense of Robinson as follows: Amauriopsis, Bahia, Bartlettia, Chamaechaenactis, Florestina, Hymenothrix, Palafoxia, Peucephyllum, Picradeniopsis, Platyschkuhria, Psathyrotopsis, and Schkuhria in Bahiinae (in Bahieae); Arnica in Arnicinae (in Madieae); Hulsea in Hulseinae (in Madieae); Syntrichopappus in Baeriinae (in Madieae); Venegasia in Venegasiinae (in Madieae); and Jamesianthus in Pectidinae (in Tageteae). (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Key |
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Source | FNA vol. 21, p. 394. | FNA vol. 21, p. 364. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Parent taxa | Asteraceae > tribe Heliantheae > subtribe Chaenactidinae > Platyschkuhria | Asteraceae > tribe Heliantheae | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Synonyms | Schkuhria integrifolia, Bahia nudicaulis, Bahia nudicaulis var. desertorum, Bahia nudicaulis var. oblongifolia, Bahia nudicaulis var. ourolepis, P. integrifolia var. desertorum, P. integrifolia var. oblongifolia, P. integrifolia var. ourolepis | subtribe Bahiinae, subtribe Palafoxiinae | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Name authority | (A. Gray) Rydberg: Bull. Torrey Bot Club 33: 155. (1906) | Rydberg: in N. L. Britton et al., N. Amer. Fl. 34: 63. (1914) | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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