Packera tridenticulata |
Packera clevelandii |
|
---|---|---|
threetooth ragwort |
Cleveland's ragwort |
|
Habit | Perennials, 10–30+ cm; taprooted (caudices ascending to erect). | Perennials, 30–80+ cm; taprooted (caudices suberect to erect, stout). |
Stems | 1 or multiple, clustered, usually glabrous, rarely sparsely floccose-tomentose, leaf axils sometimes tomentose. |
usually 1 (sometimes more, clustered), glaucous. |
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). |
(and proximal cauline, relatively thick and turgid) petiolate; blades lanceolate to narrowly oblanceolate, 30–100+ × 10–20+ mm, bases tapering, margins entire or subentire. |
Cauline leaves | gradually reduced (± petiolate or sessile). |
gradually reduced (sessile and weakly clasping; lanceolate, entire). |
Peduncles | bracteate, glabrous or sparsely tomentose. |
conspicuously bracteate, glaucous. |
Ray florets | 8–10(–13); corolla laminae 5–8+ mm. |
8–10(–13); corolla laminae 5–7 mm. |
Disc florets | 45–60+; corolla tubes 3–3.5 mm, limbs 4–5 mm. |
25–40+; corolla tubes 2–3 mm, limbs 3–4 mm. |
Phyllaries | 13 or 21, green, 6–10 mm, sparsely tomentose proximally, glabrous distally. |
(13) 21, green (tips often purple), glabrous. |
Calyculi | inconspicuous. |
conspicuous. |
Heads | 4–15+ in corymbiform arrays. |
12–20+ in open, corymbiform arrays. |
Cypselae | 1.5–2.5 mm, glabrous or sparsely hirtellous on ribs; pappi 5–6 mm. |
1–1.5 mm, glabrous; pappi 5–6 mm. |
2n | = 46. |
= 46. |
Packera tridenticulata |
Packera clevelandii |
|
Phenology | Flowering late May–early Jul. | Flowering mid Jun–mid Jul. |
Habitat | Open, dry areas, roadsides, gravelly or sandy slopes, short-grass prairies or sagebrush scrubs | Rocky, serpentine soils, open, dry, shrubby areas, dry streambeds |
Elevation | 1000–2000 m (3300–6600 ft) | 300–700 m (1000–2300 ft) |
Distribution |
CO; KS; ND; NE; NM; OK; SD; TX; WY
|
CA
|
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 clevelandii is known only from the North Coast Ranges and foothills of the Sierra Nevada on serpentine soils in chaparral communities. It is the only Packera with subsucculent, glaucous herbage. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 20, p. 601. | FNA vol. 20, p. 582. |
Parent taxa | Asteraceae > tribe Senecioneae > Packera | Asteraceae > tribe Senecioneae > Packera |
Sibling taxa | ||
Synonyms | Senecio tridenticulatus, Senecio acutidens, Senecio compactus, Senecio densus, Senecio oblanceolatus | Senecio clevelandii, Senecio clevelandii var. heterophyllus |
Name authority | (Rydberg) W. A. Weber & Á. Löve: Phytologia 49: 48. (1981) | (Greene) W. A. Weber & Á. Löve: Phytologia 49: 46. (1981) |
Web links |