Packera tridenticulata |
Packera greenei |
|
---|---|---|
threetooth ragwort |
flame ragwort |
|
Habit | Perennials, 10–30+ cm; taprooted (caudices ascending to erect). | Perennials, 20–30+ cm; rhizomatous (rhizomes horizontal to erect, not branched), sometimes stoloniferous. |
Stems | 1 or multiple, clustered, usually glabrous, rarely sparsely floccose-tomentose, leaf axils sometimes tomentose. |
1, irregularly lanate or 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) petiolate; blades orbiculate, ovate, oblanceolate, or rhombic, 20–50+ × 20–40+ mm, bases tapering, sometimes obtuse, margins coarsely dentate to crenate-dentate. |
Cauline leaves | gradually reduced (± petiolate or sessile). |
gradually to abruptly reduced (petioles broad-winged, clasping, blades obovate, bases tapering, margins irregularly dentate; distal sessile, linear to lanceolate, entire). |
Peduncles | bracteate, glabrous or sparsely tomentose. |
bracteate, lanate or tomentose distally. |
Ray florets | 8–10(–13); corolla laminae 5–8+ mm. |
8–10(–13); corolla laminae (red-orange) 8–15+ mm. |
Disc florets | 45–60+; corolla tubes 3–3.5 mm, limbs 4–5 mm. |
35–65+; corolla tubes 4–5 mm, limbs 5–6 mm. |
Phyllaries | 13 or 21, green, 6–10 mm, sparsely tomentose proximally, glabrous distally. |
21, green (tips sometimes deep red), 8–10+ mm, densely tomentose proximally, sparsely tomentose distally. |
Calyculi | inconspicuous. |
conspicuous. |
Heads | 4–15+ in corymbiform arrays. |
1–3+. |
Cypselae | 1.5–2.5 mm, glabrous or sparsely hirtellous on ribs; pappi 5–6 mm. |
1.5–2.5 mm, glabrous; pappi 8–11 mm. |
2n | = 46. |
= 40, 46, 92. |
Packera tridenticulata |
Packera greenei |
|
Phenology | Flowering late May–early Jul. | Flowering mid May–early Jul. |
Habitat | Open, dry areas, roadsides, gravelly or sandy slopes, short-grass prairies or sagebrush scrubs | Dry, rocky, usually serpentine soils, open scrub-pine associations |
Elevation | 1000–2000 m (3300–6600 ft) | 100–1600 m (300–5200 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.) |
Of conservation concern. Packera greenei is known from Coast Ranges of northern California. It has relatively large heads and bright orange-red ray corollas; its leaves are usually cyanic abaxially. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 20, p. 601. | FNA vol. 20, p. 588. |
Parent taxa | Asteraceae > tribe Senecioneae > Packera | Asteraceae > tribe Senecioneae > Packera |
Sibling taxa | ||
Synonyms | Senecio tridenticulatus, Senecio acutidens, Senecio compactus, Senecio densus, Senecio oblanceolatus | Senecio greenei |
Name authority | (Rydberg) W. A. Weber & Á. Löve: Phytologia 49: 48. (1981) | (A. Gray) W. A. Weber & Á. Löve: Phytologia 49: 47. (1981) |
Web links |