Comprehensive Description
provided by North American Flora
Ammoselinum giganteum Coult. & Rose, Contr. U. S. Nat Herb. 7: 89. 1900.
Ammoselinum occidenlale Munz & Johnston, Bull. Torrey Club 52: 224. 1925.
Branching from the base or simple, 1-2 dm. high; leaves obovate in general outline, excluding the petioles 15-25 mm. long, 2-3 cm. broad, ternate-pinnately dissected, the ultimate divisions linear, obtuse, mucronulate, 4-13 mm. long, about 1 mm. broad, glabrous to somewhat roughened; petioles 3-8 mm. long, auriculate-sheathing throughout; peduncles axillary and terminal, 4 cm. long to obsolete; involucre usually wanting; involucel of a few, linear bractlets, acute and somewhat callous-toothed, about equaling the pedicels; rays 4—8, unequal, 22 mm. long to obsolete; pedicels 1-10, unequal, 8 mm. long to obsolete; fruit oblong-ovoid, somewhat constricted toward the apex, 3-5 mm. long, about 3 mm. broad, covered with callous teeth, the ribs corky, the lateral ribs with corky appendages; oil-tubes 3 in the intervals, 2 on the commissure; seed sulcate under the tubes, the face concave.
Type locality: Mesas near Phoenix. Arizona, Pringle 28.
Distribution: Southern Arizona and California, south to Coahuila (Pringle 8314).
- bibliographic citation
- Albert Charles Smith, Mildred Esther Mathias, Lincoln Constance, Harold William Rickett. 1944-1945. UMBELLALES and CORNALES. North American flora. vol 28B. New York Botanical Garden, New York, NY
