Arida riparia

(Kunth) D. R. Morgan & R. L. Hartman

Sida20: 1414. 2003

Common names: Chiricahua mountain tansy-aster alkali aster
Synonyms: Machaeranthera riparia Machaeranthera sonorae
Basionyms: Aster riparius
Found in FNA Volume 20. Treatment on page 405. Mentioned on page 402, 403.
Annuals, 25–60 cm; taproots slender to thick. Stems 1–12+, erect or ascending, straight and rigid, sometimes sprawling from base, branching from base and distally, glabrous, glaucous. Leaves mostly cauline; sessile (± appressed); blades oblanceolate, 20–30 × 3–5 mm, reduced distally, (thick, succulent) bases broadened, margins entire (incised to dentate in hybrids with A. parviflora) eciliate or with 1–8 cilia per side, apices linear, spiny-mucronate, glabrous; distal subulate, entire. Heads borne singly (terminal), often in loose, leafy, cymiform arrays. Involucres hemispheric, 10–12 × 10–16 mm (fresh). Phyllaries in 4–5 series, appressed, linear-lanceolate, 2–8 mm, bases whitish to tan, margins entire to laciniate, apices green, acute to acuminate, glabrous. Ray florets 50–80+; laminae bluish purple to lavender, 10–12 mm, coiled after flowering. Disc florets 45–100+; corollas yellow, 3.5–5 mm. Cypselae oblanceoloid, 2.5–3 mm, 11–13-nerved per face, faces sparsely sericeous; pappi: white, setose; ray 3–3.5 mm; disc 3–4 mm. 2n = 10.

Phenology: Flowering Apr–Sep.
Habitat: Low valleys, saline soils on mudflats, edges of playas
Elevation: 1300–1400 m

Distribution

Ariz., N.Mex., Mexico (Chihuahua, Coahuila, Durango, Zacatecas).

Discussion

Arida riparia is a distinctive species recognized by its V-shaped branching, narrow, succulent, somewhat appressed, spiny-tipped leaves, and relatively large heads. It is known to hybridize with A. parviflora in southeastern Arizona and adjacent New Mexico. Specimens with dentate leaf margins usually represent hybrids.

References

None.

Facts about "Arida riparia"
AuthorRonald L. Hartman + and David J. Bogler +
BasionymAster riparius +
Common nameChiricahua mountain tansy-aster + and alkali aster +
Elevation1300–1400 m +
HabitatLow valleys, saline soils on mudflats, edges of playas +
IllustratorBee F. Gunn +
PhenologyFlowering Apr–Sep. +
ReferenceNone +
SynonymMachaeranthera riparia + and Machaeranthera sonorae +
Taxon nameArida riparia +
Taxon parentArida +
Taxon rankspecies +
VolumeVolume 20 +