Difference between revisions of "Tanacetum balsamita"
Sp. Pl. 2: 845. 1753.
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|tribe=Asteraceae tribe Anthemideae | |tribe=Asteraceae tribe Anthemideae | ||
|genus=Tanacetum | |genus=Tanacetum |
Revision as of 19:39, 24 September 2019
Perennials, 30–80(–120) cm. Stems 1, erect, simple or branched (strigose, glabrate). Leaves basal and cauline; petiolate (proximal) or sessile (distal); blades (basal and proximal cauline) mostly elliptic to oblong, 10–20 × 2–8 cm, usually not pinnately lobed (sometimes with 1–4+ lateral lobes near bases), margins ± crenate, faces usually silvery strigose or sericeous (at least when young), glabrescent, ± gland-dotted. Heads (3–)10–60+ in corymbiform arrays. Involucres (3–)5–8(–10) mm diam. (phyllaries 40–60+ in 3–4+ series, tips usually ± dilated). Receptacles flat to convex. Ray florets usually 0 [sometimes 12–15, pistillate, fertile; corollas white, laminae 4–6+ mm]. Disc corollas ca. 2 mm. Cypselae ± columnar, 1.5–2 mm, 5–8-ribbed (with non-mucilaginous glands); pappi coroniform, 0.1–0.4 mm (entire or ± toothed). 2n = 18, 54.
Phenology: Flowering Aug–Sep.
Habitat: Disturbed sites, abandoned plantings
Elevation: 0–1800 m
Distribution
![V19-817-distribution-map.gif](/w/images/3/32/V19-817-distribution-map.gif)
N.S., Ont., Que., Sask., Calif., Colo., Conn., Del., Idaho, Ill., Ind., Kans., Maine, Md., Mass., Mich., Mo., Mont., Nev., N.H., N.Y., Ohio, Oreg., Pa., R.I., S.Dak., Utah, Vt., Wash., Wis., Wyo., Asia.
Discussion
Selected References
None.