Packera tridenticulata |
Packera aurea |
|
---|---|---|
threetooth ragwort |
golden groundsel, golden ragwort |
|
Habit | Perennials, 10–30+ cm; taprooted (caudices ascending to erect). | Perennials, 30–60+ cm; rhizomatous and/or fibrous-rooted (rhizomes or caudices erect to horizontal). |
Stems | 1 or multiple, clustered, usually glabrous, rarely sparsely floccose-tomentose, leaf axils sometimes tomentose. |
1 or 2–3+, clustered, glabrous or leaf axils tomentose. |
Basal leaves | (and proximal cauline, relatively thick and turgid) petiolate; blades lanceolate or narrowly oblanceolate, 20–40+ × 5–15 mm, bases tapering, margins usually entire, sometimes sub-pinnatisect (apices subentire or dentate). |
petiolate; blades cordate to reniform, 20–60 × 20–60 mm, bases abruptly contracted or ± cordate, margins crenate to crenate-serrate (apices rounded, faces glabrous). |
Cauline leaves | gradually reduced (± petiolate or sessile). |
gradually reduced (petiolate or sessile, not clasping; blades oblong to lyrate, lateral lobes 2–4 pairs). |
Peduncles | bracteate, glabrous or sparsely tomentose. |
bracteate, glabrous or sparsely tomentose. |
Ray florets | 8–10(–13); corolla laminae 5–8+ mm. |
(8–)10–13; corolla laminae 8–10+ mm. |
Disc florets | 45–60+; corolla tubes 3–3.5 mm, limbs 4–5 mm. |
55–70+; corolla tubes 3–3.5 mm, limbs 2–2.5 mm. |
Phyllaries | 13 or 21, green, 6–10 mm, sparsely tomentose proximally, glabrous distally. |
13–21, green (tips purple or black), 6–8 mm, glabrous or sparsely tomentose proximally. |
Calyculi | inconspicuous. |
inconspicuous. |
Heads | 4–15+ in corymbiform arrays. |
6–20+ in corymbiform to subumbelliform arrays. |
Cypselae | 1.5–2.5 mm, glabrous or sparsely hirtellous on ribs; pappi 5–6 mm. |
1–1.5 mm, glabrous; pappi 4.5–5.5 mm. |
2n | = 46. |
= 44. |
Packera tridenticulata |
Packera aurea |
|
Phenology | Flowering late May–early Jul. | Flowering late Feb–early May (south), late May–early Aug (north). |
Habitat | Open, dry areas, roadsides, gravelly or sandy slopes, short-grass prairies or sagebrush scrubs | Damp and swampy places in woodlands, meadows, along gravel banks and streambeds, acidic or sandy/gravelly soils |
Elevation | 1000–2000 m (3300–6600 ft) | 0–1500 m (0–4900 ft) |
Distribution |
CO; KS; ND; NE; NM; OK; SD; TX; WY
|
AL; AR; CT; DC; FL; GA; IA; IL; IN; KY; MA; MD; ME; MI; MN; MO; MS; NC; ND; NH; NJ; NY; OH; OK; PA; RI; SC; SD; TN; VA; VT; WI; WV; MB; NB; NL; NS; ON; PE; QC; SPM
|
Discussion | Packera tridenticulata is found throughout the central High Plains, in the foothills of the Rocky Mountains, and in high valleys to the west of the Rocky Mountain front. It tends to grow in clumps; the multiple stems arise from well-developed taproots. It apparently hybridizes with P. neomexicana var. mutabilis where their ranges overlap. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Packera aurea is abundant and widespread throughout eastern United States and Canada. It reproduces asexually from branched rhizomes or from adventitious shoots. Putative hybrids between P. aurea and P. paupercula, P. pseudaurea, P. schweinitziana, and P. tomentosa have been reported. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 20, p. 601. | FNA vol. 20, p. 579. |
Parent taxa | Asteraceae > tribe Senecioneae > Packera | Asteraceae > tribe Senecioneae > Packera |
Sibling taxa | ||
Synonyms | Senecio tridenticulatus, Senecio acutidens, Senecio compactus, Senecio densus, Senecio oblanceolatus | Senecio aureus, Senecio aureus var. aquilonius, Senecio aureus var. ashei, Senecio aureus var. aurantiacus, Senecio aureus var. gracilis, Senecio aureus var. intercursus, Senecio gracilis |
Name authority | (Rydberg) W. A. Weber & Á. Löve: Phytologia 49: 48. (1981) | (Linnaeus) Á. Löve & D. Löve: Bot. Not. 128: 520. (1976) |
Web links |