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rayless goldenrod, southern goldenbush, southern jimmyweed

Herbage

usually glabrous or sparsely hispidulous, sometimes densely hirtellous, leaves sometimes stipitate-glandular, never resinous.

Leaf

blades oblanceolate to narrowly oblong-oblanceolate or nearly linear, mostly 10–40(–50) mm, margins usually entire (hispidulous-cilate, sometimes also on faces), sometimes shallowly toothed distally (especially along western margin of range; teeth in 1(–3) pairs).

Involucres

3.2–5.5 × 2.5–4 mm.

Florets

(8–)11–17(–21);

corollas 5–6 mm.

Phyllary

apices yellowish, or if green, then margins scarious, not aristate, gland-dotted, without resin pockets.

Cypsela

ribs not forming hornlike extensions.

2n

= 12, 24.

Isocoma pluriflora

Phenology Flowering (Apr–)Jul–Oct.
Habitat Igneous or calcareous substrates, sometimes over gypsum, sandy or clay loam, commonly with Larrea-Prosopis
Elevation 400–1400(–1600) m (1300–4600(–5200) ft)
Distribution
from FNA
AZ; NM; TX; Mexico (Chihuahua, Coahuila)
[WildflowerSearch map]
[BONAP county map]
Discussion

Like other species of Isocoma, I. pluriflora usually is gland-dotted, but scattered plants are stipitate-glandular.

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Source FNA vol. 20, p. 445.
Parent taxa Asteraceae > tribe Astereae > Isocoma
Sibling taxa
I. acradenia, I. arguta, I. azteca, I. coronopifolia, I. drummondii, I. humilis, I. menziesii, I. rusbyi, I. tenuisecta
Synonyms Linosyris pluriflora, Haplopappus heterophyllus, Haplopappus pluriflorus, I. wrightii
Name authority (Torrey & A. Gray) Greene: Erythea 2: 111. (1894)
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