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Published In: Species Plantarum 2: 598–599. 1753. (1 May 1753) (Sp. Pl.) Name publication detailView in BotanicusView in Biodiversity Heritage Library

Project Name Data (Last Modified On 8/25/2017)
Acceptance : Accepted
Project Data     (Last Modified On 7/9/2009)
Status: Native


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5. Scutellaria lateriflora L. (mad dog skullcap)

Pl. 442 i, j; Map 1996

Plants with slender rhizomes. Stems 15–60(–100) cm long, ascending, sometimes from a spreading base, usually branched, glabrous or sparsely pubescent on the angles with short, upward-curved, nonglandular hairs. Leaves with the petioles 5–30 mm long. Leaf blades 1–11 cm long, lanceolate to ovate, rounded to truncate or shallowly cordate at the base, sharply pointed at the tip, the margins finely to relatively coarsely toothed, the surfaces glabrous or the undersurface sparsely pubescent with short, appressed or curved, nonglandular hairs, the surfaces usually lacking sessile glands. Inflorescences of slender racemes, these mostly axillary, occasionally reduced to solitary axillary flowers, the flowers 2 per node, solitary in the axils of bracts or foliage leaves, the bracts 8–13 mm long and narrowly ovate toward the raceme base, progressively shorter and narrower toward the tip. Calyces 1.5–2.5 mm long, becoming closed and enlarged to 3–4 mm at fruiting, the outer surface moderately to densely pubescent with minute, curved, nonglandular hairs. Corollas 5–8 mm long, densely pubescent with minute, nonglandular hairs on the outer surface, pale blue or light bluish purple, rarely white, the lower lip usually lacking spots or mottling, the tube not S-shaped (nearly straight above the calyx, somewhat oblique at or above the throat), the lateral lobes not well-developed, ascending, the lower lip relatively short, oblong, usually very slightly notched at the tip. Nutlets 1–4 per calyx, 1.0–1.3 mm in diameter, depressed-globose or broadly obovoid, the surface yellowish brown, densely warty or with low, rounded tubercles. 2n=88. June–October.

Scattered nearly throughout the state (nearly throughout the U.S. [including Alaska]; Canada). Banks of streams and rivers, margins of ponds, lakes, and sinkhole ponds, bottomland forests, bases of bluffs, sloughs, marshes, and swamps; also ditches; occasionally epiphytic on floating logs, hummocks of Carex, and the lower trunks of Taxodium.

Rare plants with white corollas have been called f. albiflora (Farw.) Fernald.



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