Comprehensive Description
provided by North American Flora
Ammoselinum butleri (Engelm.) Coult. & Rose, Bot. Gaz. 12: 294. 1887.
Apium Butleri Engelm.; S. Wats. Proe. Am. Acad. 21: 453. 1886.
Branching from the base, 4-5 cm. high; leaves oblong in general outline, excluding the petioles 1-2.5 cm. long, 1-1.5 cm. broad, biternate or ternate-pinnate, the ultimate divisions linear, obtuse, mucronulate, 1-8 mm. long, 1-2 mm. broad, glabrous; petioles 5-30 mm. long, sheathing at the base; cauline leaves like the basal but the petioles entirely sheathing; umbels sessile in the axils; involucre wanting; involucel of a few foliaceous bractlets, shorter than the pedicels; rays 2-6, unequal, 20 mm. long to obsolete; pedicels 1-10, unequal, 1-6 mm. long; fruit ovoid, 2.5-3 mm. long, 1-1.5 mm. broad, glabrous to sparsely roughened with callous teeth, the ribs subacute, prominent; oil-tubes solitary in the intervals, 2 on the commissure, seed oblong in cross section, the face plane or nearly so.
Type locality: "Wet grounds near Houston," Texas, E. Hall 244. Distribution: Arkansas and Oklahoma to Texas (Bush 605, J 192, Reverchon 1035).
- 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
