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Photo: Harley, R.

Photo: Harley, R.

Subfamily

VII. Subfam. Nepetoideae (Dumort.) Luerss. (1882).

VII. 3. Tribe Ocimeae Dumort. (1829).

VII. 3. C. Subtribe Hyptidinae Endlicher (1838).

Description

Perennial herb, strongly aromatic; stems prostrate from central tap-root, rooting at nodes; leaves simple, toothed; inflorescence a solitary spherical capitulum, many-flowered, axillary, long-pedunculate, peduncle erect to ascending; capitulum with involucre of bracts and bracteoles; bracts long-subulate, becoming rigid, pungent; bracteoles as bracts; flowers sessile; calyx shortly infundibuliform, weakly zygomorphic, irregularly 5-10-lobed, lobes long-subulate, in fruit spreading and pungent, throat constricted and closed by dense white hairs, tube becoming inflated; corolla strongly 2-lipped, 5-lobed (2/3), deep purple, lobes of posterior lip rounded, anterior lip with median lobe short, directed forward, lateral lobes longer, equalling and opposing posterior lip, corolla-tube cylindric, widening slightly above; stamens exserted from tube, anthers revealing conspicuous, white pollen; style with stylopodium not extending above ovary; stigma unlobed, subcapitate to truncate; disc usually 4-lobed with anterior lobe largest or with 2 large lobes, overtopping ovary; ovules 2(-3); fruiting capitulum spinose, dispersed as a unit at maturity; nutlets large, usually 1-2 developing per flower, slightly flattened, glossy, mucilage absent.  2n=26.  One species, R. echinus (Nees & Mart.) Schauer, in dry sandy places subject to seasonal flooding, NE Brazil.

Distribution

Native to:

84 Brazil

Synonyms

Raphiodon Benth. in A.P.de Candolle, Prodr. 12: 96 (1848), orth. var.

Raphiodon Epling (1936), Epling, Rep. Spec. Nov. Beih. 85: 186-188 (1936), rev.

Publication

Rhaphiodon Schauer, Flora 27: 345 (1844).

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Image resource

Royal Botanic Gardens, Kew