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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
from FNA
CO; KS; ND; NE; NM; OK; SD; TX; WY
[WildflowerSearch map]
from FNA
ID; NV; UT
[BONAP county map]
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
P. anonyma, P. antennariifolia, P. aurea, P. bernardina, P. bolanderi, P. breweri, P. cana, P. cardamine, P. castoreus, P. clevelandii, P. contermina, P. crocata, P. cymbalaria, P. cynthioides, P. debilis, P. dimorphophylla, P. eurycephala, P. fendleri, P. flettii, P. franciscana, P. ganderi, P. glabella, P. greenei, P. hartiana, P. hesperia, P. hyperborealis, P. indecora, P. ionophylla, P. layneae, P. macounii, P. malmstenii, P. millefolium, P. millelobata, P. multilobata, P. musiniensis, P. neomexicana, P. obovata, P. ogotorukensis, P. pauciflora, P. paupercula, P. plattensis, P. porteri, P. pseudaurea, P. quercetorum, P. sanguisorboides, P. schweinitziana, P. spellenbergii, P. streptanthifolia, P. subnuda, P. tampicana, P. texensis, P. tomentosa, P. werneriifolia
P. anonyma, P. antennariifolia, P. aurea, P. bernardina, P. bolanderi, P. breweri, P. cana, P. cardamine, P. castoreus, P. clevelandii, P. contermina, P. crocata, P. cymbalaria, P. cynthioides, P. debilis, P. dimorphophylla, P. eurycephala, P. fendleri, P. flettii, P. franciscana, P. ganderi, P. glabella, P. greenei, P. hartiana, P. hesperia, P. hyperborealis, P. indecora, P. ionophylla, P. layneae, P. macounii, P. millefolium, P. millelobata, P. multilobata, P. musiniensis, P. neomexicana, P. obovata, P. ogotorukensis, P. pauciflora, P. paupercula, P. plattensis, P. porteri, P. pseudaurea, P. quercetorum, P. sanguisorboides, P. schweinitziana, P. spellenbergii, P. streptanthifolia, P. subnuda, P. tampicana, P. texensis, P. tomentosa, P. tridenticulata, P. werneriifolia
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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