Packera tridenticulata |
Packera malmstenii |
|
---|---|---|
threetooth ragwort |
Podunk ragwort |
|
Habit | Perennials, 10–30+ cm; taprooted (caudices ascending to erect). | Perennials, 8–15+ cm; rhizomatous (rhizomes relatively slender, branched). |
Stems | 1 or multiple, clustered, usually glabrous, rarely sparsely floccose-tomentose, leaf axils sometimes tomentose. |
1 or 3–5, loosely clustered, glabrous or bases and 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). |
(and proximal cauline, relatively thick and turgid) petiolate (petioles sometimes winged); blades elliptic-ovate or suborbiculate to spatulate, 15–25 × 5–20 mm, bases tapering, margins entire or dentate (at apices). |
Cauline leaves | gradually reduced (± petiolate or sessile). |
abruptly reduced (becoming sessile, bractlike). |
Peduncles | bracteate, glabrous or sparsely tomentose. |
ebracteate, glabrous. |
Ray florets | 8–10(–13); corolla laminae 5–8+ mm. |
(0) or 8–13; corolla laminae 7–9 mm. |
Disc florets | 45–60+; corolla tubes 3–3.5 mm, limbs 4–5 mm. |
35–50+; corolla tubes 2–3 mm, limbs 2.5–3.5 mm. |
Phyllaries | 13 or 21, green, 6–10 mm, sparsely tomentose proximally, glabrous distally. |
13, cyanic, 8–9 mm, glabrous or loosely tomentose proximally. |
Calyculi | inconspicuous. |
inconspicuous. |
Heads | 4–15+ in corymbiform arrays. |
1–2(–4). |
Cypselae | 1.5–2.5 mm, glabrous or sparsely hirtellous on ribs; pappi 5–6 mm. |
1–2 mm, glabrous; pappi 3–4.5 mm. |
2n | = 46. |
|
Packera tridenticulata |
Packera malmstenii |
|
Phenology | Flowering late May–early Jul. | Flowering mid Jul–early Aug. |
Habitat | Open, dry areas, roadsides, gravelly or sandy slopes, short-grass prairies or sagebrush scrubs | Steep talus of limestone-derived slopes at or above timberline |
Elevation | 1000–2000 m (3300–6600 ft) | 2600–3600 m (8500–11800 ft) |
Distribution |
CO; KS; ND; NE; NM; OK; SD; TX; WY
|
ID; NV; UT |
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.) |
Of conservation concern. Packera malmstenii is poorly known; it has obvious affinities with P. werneriifolia in both morphology and habitat preference. Its herbage tends to be thick and turgid. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 20, p. 601. | FNA vol. 20, p. 591. |
Parent taxa | Asteraceae > tribe Senecioneae > Packera | Asteraceae > tribe Senecioneae > Packera |
Sibling taxa | ||
Synonyms | Senecio tridenticulatus, Senecio acutidens, Senecio compactus, Senecio densus, Senecio oblanceolatus | Senecio malmstenii |
Name authority | (Rydberg) W. A. Weber & Á. Löve: Phytologia 49: 48. (1981) | (S. F. Blake ex Tidestrom) Kartesz: in J. T. Kartesz and C. A. Meacham, Synth. N. Amer. Fl., nomencl. innov. 21. (1999) |
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