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Subfamily

III. Subfam. Ajugoideae Kostel. (1834).

Subfam. Teucrioideae (Dumort.) Caruel (1884).

Description

Annual herb, slightly aromatic; leaves opposite, petiolate, deeply 3-lobed, serrate; inflorescence a lax, terminal paniculiform thyrse; flowers minute; calyx actinomorphic, accrescent, 5-lobed; corolla pale lavender, zygomorphic, 5-lobed, anterior lobe largest, concave; stamens 2 fertile, posterior pair reduced to staminodes, filaments arched, thecae divaricate, confluent at dehiscence; pollen with supratectal spinules; ovary unlobed; stigma-lobes unequal; disc absent; nutlets obovoid, reticulately ridged, glabrous, attachment-scar lateral, 0.7-0.8x as long as nutlet; endosperm present. 2n = 20, 26. One species, Amethystea caerulea L., widespread in open, disturbed habitats in temperate Asia.

Distribution

Native to:

30 Siberia
31 Russian Far East
32 Middle Asia
34 Western Asia
36 China
37 Mongolia
38 Eastern Asia

Synonyms

Amethystina Zinn, Cat. Pl. Hort. Gott.: 318 (1757).

Publication

Amethystea L., Sp. Pl. 1: 21 (1753); Gen. Pl. ed. 5: 13 (1754).

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Image resource

Royal Botanic Gardens, Kew