Packera ionophylla |
Packera tridenticulata |
|
---|---|---|
Tehachapi ragwort |
threetooth ragwort |
|
Habit | Perennials, 15–30+ cm; taprooted (caudices erect) or rhizomatous (rhizomes branched). | Perennials, 10–30+ cm; taprooted (caudices ascending to erect). |
Stems | usually 1, rarely 2–3, clustered, irregularly arachnoid-tomentose to lanate-tomentose or glabrescent. |
1 or multiple, clustered, usually glabrous, rarely sparsely floccose-tomentose, leaf axils sometimes tomentose. |
Basal leaves | (and proximal cauline, relatively turgid) petiolate; blades broadly ovate or lyrate (± pinnately lobed, lateral lobes 1–3 pairs, smaller than terminals), 10–30+ × 10–20+ mm, bases tapering to cuneate, ultimate margins subentire or crenate to coarsely dentate (abaxial faces tomentose). |
(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). |
Cauline leaves | gradually reduced (sessile; bractlike, entire). |
gradually reduced (± petiolate or sessile). |
Peduncles | bracteate, irregularly tomentose. |
bracteate, glabrous or sparsely tomentose. |
Ray florets | 8–13; corolla laminae 8–10 mm. |
8–10(–13); corolla laminae 5–8+ mm. |
Disc florets | 60–75+; corolla tubes 2.5–4 mm, limbs 3.5–5 mm. |
45–60+; corolla tubes 3–3.5 mm, limbs 4–5 mm. |
Phyllaries | (8–)13 or 21, green, 7–10+ mm, densely tomentose proximally, glabrescent distally (tips hair-tufted). |
13 or 21, green, 6–10 mm, sparsely tomentose proximally, glabrous distally. |
Calyculi | inconspicuous. |
inconspicuous. |
Heads | 3–6 in cymiform arrays. |
4–15+ in corymbiform arrays. |
Cypselae | 2–2.5 mm, glabrous; pappi 5–7 mm. |
1.5–2.5 mm, glabrous or sparsely hirtellous on ribs; pappi 5–6 mm. |
2n | = 46. |
= 46. |
Packera ionophylla |
Packera tridenticulata |
|
Phenology | Flowering early Jun–late Aug. | Flowering late May–early Jul. |
Habitat | Dry, rocky slopes, crevices, granitic outcrops, coniferous woodlands | Open, dry areas, roadsides, gravelly or sandy slopes, short-grass prairies or sagebrush scrubs |
Elevation | 1400–3000 m (4600–9800 ft) | 1000–2000 m (3300–6600 ft) |
Distribution |
CA
|
CO; KS; ND; NE; NM; OK; SD; TX; WY
|
Discussion | Of conservation concern. Packera ionophylla is known only from the San Bernardino, San Gabriel, and Tehachapi mountains and a population on Alamo Mountain in eastern Ventura County. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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.) |
Source | FNA vol. 20, p. 590. | FNA vol. 20, p. 601. |
Parent taxa | Asteraceae > tribe Senecioneae > Packera | Asteraceae > tribe Senecioneae > Packera |
Sibling taxa | ||
Synonyms | Senecio ionophyllus, Senecio ionophyllus var. intrepidus | Senecio tridenticulatus, Senecio acutidens, Senecio compactus, Senecio densus, Senecio oblanceolatus |
Name authority | (Greene) W. A. Weber & Á. Löve: Phytologia 49: 47. (1981) | (Rydberg) W. A. Weber & Á. Löve: Phytologia 49: 48. (1981) |
Web links |