Herbs, sometimes subshrubs or shrubs, annual or perennial, usually aromatic. Stems and branches usually 4-angled. Leaves opposite, rarely whorled or alternate, simple to pinnately dissected or compound, without stipules. Inflorescences generally compound, sometimes flowers solitary and axillary; verticillasters 2- to many flowered, subtended by leaves or bracts. Flowers bisexual, zygomorphic, rarely subactinomorphic, bracteolate or not. Calyx persistent, 5-toothed, 2-lipped; upper lip 3-toothed or entire (deciduous in Scutellaria) ; lower lip 2- or 4-toothed; tube sometimes hairy annulate inside. Corolla limb usually 2-lipped; upper lip 2-lobed and lower 3-lobed, rarely upper lip entire and lower 4-lobed, also rarely limb (4- or) 5-lobed; tube hairy annulate inside. Stamens epipetalous, 4 or 2, free, rarely filaments connate, sometimes one staminodial; anther 1- or 2-celled, usually dehiscing longitudinally; disc persistent. Ovary superior, 2-celled and each cell 2-ovuled and style subterminal, or ovary 4-parted and each lobe 1-ovuled and style gynobasic (from bases of ovary lobes) with 2-cleft apex. Fruit usually 4 dry nutlets. Seeds with or without endosperm.
Approximately 3500 species in 220 genera, distributed worldwide, but mostly in the Mediterranean region and SW Asia. China has 807 species in 96 genera.[1]
There are approximately 193 species, subspecies, varieties, forms, and cultivars in this genus. Here are just 100 of them: R. adenantha · R. adenoloma · R. albopilosa · R. alborubra · R. amethystoides · R. angustifolia · R. angustifolia var. glabrescens · R. anisochila · R. arakii · R. assamica · R. bifidocalyx · R. brachythyrsa · R. brevicalcarata · R. brevifolia · R. bulleyana · R. bulleyana var. foliosa · R. calcicola · R. calcicola var. subcalva · R. calycina · R. capillipes · R. chionantha · R. coesta · R. coesta var. hookeri · R. coetsa · R. coetsa var. cavaleriei · R. coetsoides · R. colaniae · R. daitonensis · R. dakglayensis · R. dawoensis · R. dhankutana · R. dichromophylla · R. drogotschiensis · R. effusa · R. effusa f. leucantha · R. enanderana · R. eriocalyx · R. eriocalyx var. laxiflora · R. excisa · R. excisa f. albiflora · R. excisa var. chiisanensis · R. excisoides · R. fangii · R. flabelliformis · R. flavida · R. flexicaulis · R. forrestii · R. forrestii var. intermedia · R. gesneroides · R. gibbosa · R. glaucocalyx · R. glutinosa · R. grandifolia · R. grandifolia var. atuntzensis · R. grosseserrata · R. henryi · R. hirtella · R. hispida · R. inflexa · R. inflexa f. albiflora · R. inflexa f. leucantha · R. inflexa var. macrophylla · R. interrupta · R. irrorata · R. irrorata var. crenata · R. irrorata var. longipes · R. irrorata var. rungshiaensis · R. japonica · R. japonica (Burm.f.) Hara var. glaucocalyx (Maxim.) Hara · R. japonica f. albida · R. japonica f. albiflora · R. japonica var. glaucocalyx · R. javanica · R. kangtingensis · R. koroensis · R. kunmingensis · R. kurzii · R. lasiocarpa · R. latiflora · R. latifolia · R. leucophylla · R. liangshanica · R. lihsienensis · R. longituba (Trumpet Spurflower) · R. longituba f. albiflora · R. longituba var. contracta · R. lophanthoides · R. lophanthoides var. brachyantha · R. lophanthoides var. gerardiana · R. lophanthoides var. graciliflorus · R. lophanthoides var. kerrii · R. lophanthoides var. micrantha · R. loxothyrsa · R. lungshengensis · R. macrantha · R. macrocalyx · R. macrophylla · R. macrophylla f. qingliangfenensis · R. maddenii · R. medilungensis
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