Xylorhiza cognata

(H. M. Hall) T. J. Watson

Brittonia 29: 204. 1977.

Common names: Mecca woody-aster
EndemicConservation concern
Basionym: Aster cognatus H. M. Hall Univ. Calif. Publ. Bot. 6: 173. 1915
Synonyms: Machaeranthera cognata (H. M. Hall) Cronquist & D. D. Keck
Treatment appears in FNA Volume 20. Treatment on page 407. Mentioned on page 406.

Shrubs, 50–150 cm. Stems branched to near apices, glabrescent (younger stems and branches stipitate-glandular). Leaf blades spatulate to ovate, 3–20 mm wide, bases attenuate, subclasping, margins flat, coarsely spinulose-toothed, faces glabrous, sparsely stipitate-glandular. Peduncles 5–11(–20) cm. Involucres 15–20 × 20–40 mm. Phyllaries loosely appressed, outermost (at least margins) stipitate-glandular, innermost shorter than mid. Ray florets (12–)20–29(–32); corollas light blue to violet. Style-branch appendages shorter than stigmatic lines. 2n = 12.


Phenology: Flowering Jan–Apr(–Jun).
Habitat: Slopes and bottoms of deep ravines in clay, rocky sand, and gravel
Elevation: 20–300 m

Discussion

Of conservation concern.

Xylorhiza cognata is known only from Riverside County.

Selected References

None.

Lower Taxa

None.