Prunella 夏枯草屬
型態特徵
Herbs perennial. Leaves pinnatifid to subentire. Verticillasters 6-flowered, in terminal ovoid or ovoid-globose spikes; bracts broad, membranous, margins ciliate, overlapping; bracteoles minute or absent; pedicel very short or absent; calyx tubular-campanulate, more or less flattened dorsiventrally, irregularly 10-veined, netted between veins, 2-lipped, base hairy, throat glabrous, upper lip flat, truncate, shortly 3-toothed, lower lip 2-cleft to 1/2 of lip, teeth lanceolate, mouth enclosed in fruit; corolla tube gradually dilated on 1 side, exserted, throat slightly constricted, scaly annulate inside, limb 2-lipped, upper lip straight, galeate, margin entire, lower lip 3-lobed, middle lobe largest, concave, denticulate, lateral lobes oblong, reflexed; stamens 4, anterior 2 longer, ascending to underside of upper lip, parallel, free; filament apex dentate; anther cells 2, divaricate; ovary glabrous; style glabrous, apex equally 2-cleft, lobes subulate. Nutlets brown, subglobose, ovoid to oblong, glabrous, smooth or tuberculate, apex rounded.
About seven broadly defined species (15 according to some authors), distributed in Africa, Asia, Europe, North America; one species in Taiwan.
