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]
Subshrubs or perennial or annual herbs, usually aromatic, occasionally gynomonoecious or gynodioecious. Verticillasters in spikes or opposite cymes in racemes or panicles; floral leaves bractlike; bracts narrow, shorter than to longer than flowers. Calyx (13-) 15(-17) -veined, tubular or campanulate, slightly curved or straight, throat oblique or regular; limb 2-lipped or not; teeth 5, equal or unequal, subulate or narrowly lanceolate to oblong-triangular, apex acuminate to spiny-acuminate. Corolla 2-lipped; tube basally narrow, ± abruptly dilated into an ample throat; upper lip ± flat or concave, 2-lobed or emarginate; lower lip large, 3-lobed, with middle lobe larger, concave or ± flat, margin undulate or dentate; lateral lobes small, straight or reflexed, ovate to semicircular. Stamens 4, nearly parallel, glabrous, ascending under upper lip of corolla, posterior 2 longer than anterior, included or exserted, fertile; stamens of pistillate flowers rudimentary, included; anther cells 2, ellipsoid, divaricate, apex not confluent. Style exserted, apex subequally 2-cleft. Nutlets oblong-ovoid, ellipsoid, ovoid, or obovoid, adaxially slightly ribbed, smooth or warty.
About 250 species: temperate Asia, N Africa, and Europe, most abundant in the Mediterranean region and SW and C Asia; 42 species in China.[2]
Flowers: Bloom Period: April, May, June, July, August. • Flower Color: dark blue
Culture: Space 15-18" apart.
Soil: Minimum pH: 6.1 • Maximum pH: 7.8
Sunlight: Sun Exposure: Full Sun.
Temperature: Cold Hardiness: 3a, 3b, 4a, 4b, 5a, 5b, 6a, 6b, 7a, 7b, 8a, 8b. (map)
There are approximately 800 species, subspecies, varieties, forms, and cultivars in this genus. Here are just 100 of them: N. amethystina laciniata · N. amethystina mallophora · N. amethystina microglandulosa · N. apulei oulmesiana · N. apulei pallescens · N. argolica dirphya · N. betonicifolia somkhetica · N. betonicifolia strictifolia · N. cataria verticillata · N. coerulea sanabriensis · N. cyanea biebersteiniana · N. glomerulosa carmanica · N. glomerulosa ghorana · N. glomerulosa stapfiana · N. italica cadmea · N. italica rigidula · N. italica troodi · N. juncea ghorana · N. mallophora microglandulosa · N. murcica toranzii · N. nepetella aragonensis · N. nepetella cordifolia · N. nuda coerulea · N. nuda latifolia · N. podostachys darwasica · N. podostachys paulsenii · N. racemosa crassifolia · N. racemosa haussknechtii · N. sibthorpii dirphya · N. sibthorpii malacotrichos · N. sibthorpii tumeniana · N. sibthorpii vourinensis · N. sulphurea lydiae · N. supina buschii · N. teucriifolia carmanica · N. teucriifolia daghestanica · N. tuberosa rivasgodayana · N. ucrainica kopetdaghensis · N. ucrainica schischkinii · N. ucranica parviflora · N. 'Ani' · N. 'Bide-a-Wee Variegated' · N. 'Blue Beauty' · N. 'Gottfried Kühn' · N. 'Leeds Castle' · N. 'Lilac Cloud' · N. 'Pink Dawn' · N. 'Porzellan' · N. 'Purple Blotch' · N. 'Rae Crug' · N. 'Six Hills Giant' · N. 'Thornbury' · N. 'Valerie Finnis' · N. 'Veluws Blauwtje' · N. abyssinica · N. acerosa · N. acinifolia · N. adenoclada · N. adenophyta · N. agrestis · N. alaghezi · N. alatavica · N. alba · N. alexeenkoi · N. algeriensis · N. alicae · N. alii · N. allotria · N. almeriensis · N. altissima · N. amani · N. amboinica · N. americana · N. amethystina · N. amethystina anticaria · N. amethystina subsp. anticaria · N. amethystina subsp. laciniata · N. amethystina subsp. mallophora · N. amethystina subsp. microglandulosa · N. amethystina var. anticaria · N. amethystina var. bourgaei · N. amicorum · N. amoena · N. anamurensis · N. andrica · N. angustifolia · N. annua · N. antiatlantica · N. apulei · N. apulei subsp. oulmesiana · N. apulei subsp. pallescens · N. apuleii · N. apuleji · N. aragonensis · N. aragonesis · N. archibaldii · N. argentea · N. arglonensis · N. argolica · N. argolica malacotrichos
There are approximately 6,954 species, subspecies, varieties, forms, and cultivars in this genus. Here are just 100 of them: P. multicale subherbaceum · P. reniforme velutinum · P. stipulaceum ovato-stipulatum · P. abbreviatum · P. abutiloides · P. accedens · P. aceroides · P. acetabulosum · P. acidum · P. actinogramma · P. acutangulum · P. acutidentatum · P. acutifolium · P. acutilobum · P. adelinae · P. adscendens · P. adventitium · P. aemulum · P. affluens · P. agathosmum · P. agonizans · P. albinotatum · P. alienatum · P. allenii · P. alstromeriae · P. altum · P. amabile · P. amaryllidis · P. amauron · P. amoenum · P. ampliatum · P. anacampton · P. anais · P. anisodonton · P. annesleyanum · P. anomalanthum · P. anomalum · P. anosmon · P. anthriscifolium · P. antonianum · P. aquilinum · P. ardescens · P. argutum · P. atropurpureum · P. atrorubens · P. atrovirens · P. augustissimum · P. aulicum · P. aurantiacum · P. aurareum · P. auriculaeflorum · P. auriculatum · P. avronianum · P. bakerianum · P. baldinianum · P. barclayanum · P. basiicum · P. baumannianum · P. beadoniae · P. belladonna · P. biflorum · P. bipinnatifidum · P. bishopae · P. bivulnerum · P. bluntianum · P. boleyniae · P. boscaweniae · P. brassicatum · P. brayanum · P. brevipes · P. brightianum · P. broadleyae · P. broughtoniae · P. bryoniaefolium · P. burnettianum · P. byronianum · P. calamistratum · P. calliston · P. callodon · P. calocephalon · P. calographicum · P. calycinum · P. camaldulense · P. campyliaeflorum · P. campylosepalum · P. carbasinum · P. carbonatum · P. carnescens · P. carolinaeum · P. cartilagineum · P. caryophyllaceum · P. castaliaefolium · P. castum · P. cavrianum · P. cephalanthum · P. cernuum · P. chaerophyllum · P. chamaerhodon · P. chandleri · P. charlwoodii
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