Adenostoma sparsifolium

Torrey in W. H. Emory

in W. H. Emory, Not. Milit. Reconn.,140. 1848

Common names: Red shank ribbon bush
Found in FNA Volume 9. Treatment on page 394. Mentioned on page 393.
Plants erect, 20–60 dm. Stems erect to spreading; bark distinctively cinnamon-colored, papery-layered; young stem internodes yellowish green, 1.5–7(–15) mm (marked with slender paired decurrent grooves), finely hirtellous, sessile-glandular. Leaves on slender long shoots, proximal 1–2 opposite, distal subalternate or alternate; stipules absent; blade yellow-green, linear to terete, (2.5–)5–14(–26) × 0.4–0.6(–0.8) mm, apex recurved-apiculate, surfaces sparsely hirtellous and sessile-glandular. Inflorescences paniculate or reduced to spicate racemes (terminating all distal, long shoots of season), 0.8–5(–7.5) cm, hirtellous; subtending flower bracts linear-subulate; bracteoles 5 or 6, outermost subulate, inner oblong-ovate, concave. Pedicels present or absent. Flowers in sessile clusters of 2–3 (or single and pedicellate); hypanthium greenish, 0.6–2 mm, hirtellous, inner rims yellowish; sepals broadly ovate, 0.6–1 mm; petals persistent, whitish, turning rusty brown, elliptic to ovate, 1.5–2.2 mm; stamens 10(–12), filaments 1–1.5 mm, anthers 0.4–0.6 mm; ovaries obliquely obovoid; styles erect, pinkish, 0.5–1 mm. Achenes ellipsoid, 1.1–1.6 mm, exserted from hypanthium. 2n = 18.

Phenology: Flowering Jul–Aug(–Sep).
Habitat: Dry granitic slopes, mesas, ravines, chaparral, pinyon woodlands
Elevation: 200–2000 m

Distribution

Calif., Mexico (Baja California).

Discussion

Adenostoma sparsifolium is known in southern California from San Luis Obispo and Santa Barbara to Riverside and San Diego counties, and in northern Baja California.

References

None.

AuthorWilliam Jones + and James Henrickson +
Common nameRed shank + and ribbon bush +
Elevation200–2000 m +
HabitatDry granitic slopes, mesas, ravines, chaparral, pinyon woodlands +
IllustratorMarjorie C. Leggitt +
PhenologyFlowering Jul–Aug(–Sep). +
ReferenceNone +
Taxon nameAdenostoma sparsifolium +
Taxon parentAdenostoma +
Taxon rankspecies +
VolumeVolume 9 +