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oppositeleaf bahia, plains bahia

bahia

Habit Plants ± erect or spreading, 3–15(–20+) cm. Perennials, 3–20+ cm (± rhizomatous, sometimes forming colonies).
Stems

± erect or spreading, branched ± throughout.

Leaves

lobes lanceolate to linear, 10–25+ × 1–3(–8) mm, faces ± canescent-scabrellous and gland-dotted.

cauline; all or mostly opposite; petiolate or sessile;

blades mostly ternately lobed (blades or lobes lanceolate to lance-linear), ultimate margins entire, faces sparsely to densely scabrellous (hairs white, straight, conic or fusiform, 0.1–0.4 mm) and gland-dotted.

Heads

radiate, borne singly or (3–6) in loose, corymbiform arrays.

Involucres

broadly turbinate to hemispheric, 5–6+ × 6–9+ mm.

turbinate or obconic to ± hemispheric, 5–6+ mm diam.

Receptacles

± convex, ± pitted, epaleate.

Ray florets

3–5(–6);

corollas pale yellow, laminae 3–5 mm.

3–8, pistillate, fertile;

corollas usually yellow, sometimes ochroleucous.

Disc florets

30–60+;

corollas 3.5–5 mm.

20–40+, bisexual, fertile;

corollas yellow to orange (gland-dotted), tubes about equaling funnelform to campanulate throats, lobes 5, deltate to lance-deltate.

Phyllaries

persistent, 6–10 in 1–2 series (reflexed in fruit, distinct, oblanceolate, subequal, herbaceous, margins membranous, not purplish).

Cypselae

3–5 mm, usually gland-dotted, seldom hirsutulous;

pappus scales usually ovate or elliptic to obovate, sometimes lanceolate, 0.5–1.5 mm.

narrowly obpyramidal, 4-angled, finely nerved, shaggily hairy (at least at bases) and/or gland-dotted;

pappi persistent, of 8–10 (distinct) ovate or elliptic to lanceolate or linear-subulate (basally and/or medially thickened, distally and/or laterally scarious) scales in 1 series (weakly, if at all, aristate).

x

= 12.

2n

= 48.

Picradeniopsis oppositifolia

Picradeniopsis

Phenology Flowering Jun–Oct.
Habitat Roadsides, saline flats, shale sites
Elevation 900–2500 m [3000–8200 ft]
Discussion

Species 2 (2 in the flora).

According to T. F. Stuessy et al. (1973), among others, Picradeniopsis is closely allied to Bahia. Indeed, the species are often treated as members of Bahia. Where they occur together, the two species of Picradeniopsis may produce more or less sterile hybrids.

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

Distribution
from FNA
AZ; CO; KS; MT; ND; NE; NM; OK; SD; TX; WY
[WildflowerSearch map]
[BONAP county map]
from USDA
w United States; c United States
[BONAP county map]
Parent taxa Asteraceae > tribe Heliantheae > subtribe Chaenactidinae > Picradeniopsis Asteraceae > tribe Heliantheae > subtribe Chaenactidinae
Sibling taxa
P. woodhousei
Subordinate taxa
P. oppositifolia, P. woodhousei
Key
1.Cypselae usually gland-dotted, seldom hirsutulous; scales of pappi usually ovate or elliptic to obovate, sometimes lanceolateP. oppositifolia
1.Cypselae seldom gland-dotted, usually hirsutulous; scales of pappi usually lanceolate to linear-subulateP. woodhousei
Synonyms Trichophyllum oppositifolium, Bahia oppositifolia
Name authority (Nuttall) Rydberg: in N. L. Britton, Man. Fl. N. States, 1008. (1901) Rydberg ex Britton: Man. Fl. N. States, 1008. (1901)
Source Flora of North America vol. 21, p. 385. Flora of North America vol. 21, p. 384.
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