Grindelia subalpina |
Grindelia arizonica |
|
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subalpine gumweed |
Arizona gumweed, cutleaf gumweed, New Mexican gumweed |
|
Habit | Biennials or perennials (perhaps flowering first year), 15–30(–60) cm. | Perennials, (10–)25–70 cm. |
Stems | erect, usually reddish, sometimes stramineous, glabrous. |
erect, stramineous to reddish, glabrous. |
Cauline leaf | blades spatulate or oblanceolate to oblong or lanceolate, 15–70 mm, lengths 3–5(–7) times widths, bases ± cuneate or clasping, margins usually dentate or serrate (teeth apiculate), sometimes entire, apices rounded or obtuse to acute, faces glabrous (or, near margins, scabridulous) and sparsely to densely gland-dotted. |
blades oblong, spatulate, or oblanceolate to linear, 15–45(–85) mm, lengths mostly 3–8 times widths, bases ± cuneate, margins serrate (teeth from bases to apices or mostly toward apices, apiculate to setose), entire, or (proximal leaves) pinnately lobed to coarsely toothed, apices acute, faces glabrous (or scabridulous near margins), sparsely, or not at all, gland-dotted. |
Involucres | broadly urceolate to globose, 8–11 × 10–20 mm. |
usually campanulate to obconic, sometimes hemispheric, 4–11 × 8–17 mm. |
Ray florets | 18–27; laminae 10–15 mm. |
0 or 8–26; laminae (5–)7–10 mm. |
Phyllaries | in 5–6 series, linear or lanceolate to oblong-lanceolate, apices looped to hooked (outer) or recurved to nearly straight, terete to subulate or acuminate, slightly to moderately resinous. |
in 4–6 series, linear to ± lanceolate, usually appressed, sometimes weakly reflexed or spreading, apices slightly recurved to straight, subulate or acuminate to deltate, slightly to strongly resinous. |
Heads | usually in open, corymbiform to paniculiform arrays, seldom borne singly. |
usually in corymbiform to paniculiform arrays, rarely borne singly. |
Cypselae | whitish or stramineous, 2.5–5 mm, apices smooth or weakly coronate, faces smooth or finely furrowed; pappi of 4–8 straight, barbellate to barbellulate bristles or setiform awns 2.5–5.5 mm, shorter than disc corollas. |
stramineous to brown, 2.5–4 mm, apices coronate or knobby, faces striate to furrowed; pappi of 2–4 straight or weakly contorted, smooth setiform awns or subulate scales 2–5 mm, shorter than disc corollas. |
2n | = 12. |
= 12. |
Grindelia subalpina |
Grindelia arizonica |
|
Phenology | Flowering Jul–Aug. | Flowering Jun–Sep(–Oct). |
Habitat | Dry, open, sandy or gravelly slopes, ridges, valleys, stream banks, waste grounds | Open, rocky slopes, mesas, ridges, canyons, fields, stream banks |
Elevation | 1600–2900 m (5200–9500 ft) | (300–)1500–2500 m ((1000–)4900–8200 ft) |
Distribution |
CO; WY
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AZ; CO; NM; TX; UT; Mexico (Chihuahua, Coahuila)
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Discussion | Plants of Grindelia arizonica with ± hemispheric involucres and apices of phyllaries ± subulate (versus lance-acuminate to deltate) have been called var. neomexicana (or G. neomexicana). Plants known as var. stenophylla differ from typical G. arizonica in having leaf margins toothed mostly toward apices (versus toothed from bases to apices). Plants of G. arizonica (from northern Arizona, southwestern Colorado, and southeastern Utah) with leaf margins pinnately lobed to ± laciniate or coarsely dentate have been called G. laciniata. Some herbarium specimens that have been identified as G. aphanactis (see 4. G. squarrosa) appear to be discoid plants of G. arizonica. Hybrids between G. arizonica and G. squarrosa have been recorded from Colorado and Utah. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Source | FNA vol. 20, p. 434. | FNA vol. 20, p. 435. |
Parent taxa | Asteraceae > tribe Astereae > Grindelia | Asteraceae > tribe Astereae > Grindelia |
Sibling taxa | ||
Synonyms | G. erecta, G. subalpina var. erecta | G. arizonica var. dentata, G. arizonica var. microphylla, G. arizonica var. neomexicana, G. arizonica var. stenophylla, G. laciniata, G. neomexicana, G. scabra var. neomexicana |
Name authority | Greene: Pittonia 3: 297. (1898) | A. Gray: Proc. Amer. Acad. Arts 17: 208. (1882) |
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