Madia gracilis |
Madia glomerata |
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common tarweed, grassy tarplant, grassy tarweed, gumweed, slender tarweed |
cluster tarweed, mountain tarplant, mountain tarweed |
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Habit | Plants 6–100 cm, self-compatible (heads not showy). | Plants 5–120 cm, self-compatible (heads not showy). |
Stems | proximally pilose to hirsute, distally glandular-pubescent, glands yelloish, purple, or black, lateral branches seldom surpassing main stems. |
proximally villous to hispid, glandular-pubescent distally, glands yellowish or black, lateral branches sometimes surpassing main stems. |
Leaf | blades oblong to linear, 1–10(–15) cm × 1–8(–10) mm. |
blades linear to lance-linear, 2–10 cm × 2–7 mm. |
Involucres | depressed-globose to urceolate, 5–10 mm. |
narrowly ovoid or ellipsoid, 5.5–9 mm. |
Ray florets | 3–10; corollas lemon yellow or greenish yellow, laminae 1.5–8 mm. |
0 or 1–3; corollas greenish yellow to purplish, laminae 1–3 mm. |
Disc florets | 2–16+, bisexual, fertile; corollas 2.5–5 mm, pubescent; anthers ± dark purple. |
1–5(–12), bisexual, fertile; corollas 3–4.5 mm, pubescent; anthers ± dark purple. |
Phyllaries | sometimes hirsute, always finely or coarsely glandular-pubescent, glands yellowish, purple, or black, apices erect or ± reflexed, flat. |
± pilose and glandular-pubescent, glands yellowish or black, apices erect or reflexed, ± flat. |
Heads | in ± open, paniculiform or racemiform arrays. |
usually in crowded glomerules, sometimes in corymbiform or paniculiform arrays. |
Disc cypselae | similar. |
similar. |
Ray cypselae | black, purple, or mottled, dull, compressed, beakless (or nearly so). |
black, dull, compressed, beakless. |
Paleae | mostly persistent, connate 1/2+ their lengths. |
mostly persistent, distinct. |
2n | = 32, 48. |
= 28. |
Madia gracilis |
Madia glomerata |
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Phenology | Flowering Apr–Aug. | Flowering Jun–Sep. |
Habitat | Open or partially shaded slopes or flats in grasslands, meadows, shrublands, woodlands, and forests, disturbed sites, stream banks, roadsides, coarse to fine textured soils, sometimes serpentine | Openings in grasslands, meadows, swales, shrublands, woodlands, forests, edges of marshes, lakes, or watercourses, disturbed sites, often in coarse, sandy or gravelly soils |
Elevation | 0–2500 m (0–8200 ft) | 0–3100 m (0–10200 ft) |
Distribution |
CA; ID; MT; NV; OR; UT; WA; BC; Mexico (Baja California)
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AK; AZ; CA; CO; CT; IA; ID; ME; MI; MN; MT; ND; NM; NV; OR; SD; UT; VT; WA; WY; AB; BC; MB; ON; QC; SK; YT
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Discussion | Madia gracilis occurs widely in California (except the warm deserts), is scattered across much of Nevada, Oregon, and Washington (outside the driest regions), and extends into southernmost British Columbia, north-western Montana, and northern Utah. Near the coast, M. gracilis sometimes co-occurs with M. sativa; the two species are partially interfertile (M. gracilis tends to flower earlier than M. sativa; J. Clausen 1951). Reported occurrences of M. gracilis in Maine and South America have not been confirmed. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Madia glomerata has the most extensive North American distribution of any species in Madiinae. At southern latitudes, M. glomerata occurs mostly in montane settings. Occurrences in eastern North America are mostly local and widely scattered. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 21, p. 308. | FNA vol. 21, p. 306. |
Parent taxa | Asteraceae > tribe Heliantheae > subtribe Madiinae > Madia | Asteraceae > tribe Heliantheae > subtribe Madiinae > Madia |
Sibling taxa | ||
Synonyms | Sclerocarpus gracilis, M. gracilis subsp. collina, M. gracilis subsp. pilosa | |
Name authority | (Smith) D. D. Keck: Madroño 5: 169. (1940) | Hooker: Fl. Bor.-Amer. 2: 24. (1834) |
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