Ammannia

de Wilde, W. J. J. O. & Duyfjes, B. E. E., 2014, Ammannia (Lythraceae) in Malesia, Blumea 59 (1), pp. 11-18 : 11

Ammannia

Ammannia L. (1753) 119;S.A. Graham (1985) 402;(2007) 236. — Lectotype ( Britton & Brown 1913): A. latifolia L.

Nesaea Comm. ex Kunth (1823) 151; S.A. Graham (2007) 240. — Type: Nesaea triflora ( L.f.) Kunth .

1 Naturalis Biodiversity Center, section Botany, P.O. Box 9517, 2300 RA Leiden, The Netherlands;

corresponding author e-mail: [e-mail].

Cryptotheca Blume (1826) 1128;(1856) 9. — Ammannia L.subg. Cryptotheca (Blume) Koehne (1880) 262. — Lectotype ( Blume 1856): Cryptotheca dichotoma Blume = Ammannia dichotoma (Blume) S.G.Panigrahi.

Diplostemon (Wight & Arn.) Miq. (1856) 615. — Ammannia sect. Diplostemon (‘ Dyplostemonae ’) DC. (1828) 80. — Ammannia subg. Diplostemon Wight & Arn. (1834) 304. — Lectotype ( Wight & Arnott 1834): Ammannia octandra L.f.

Ammannella Miq. (1856) 618. — Type: Ammannella linearis Miq. = Ammannia octandra L.f.

Hapalocarpum (Wight & Arn.) Miq. (1856) 618. — Ammannia subg. Hapalocarpum Wight & Arn. (1834) 305. — Lectotype (here designated): Ammannia vesicatoria Roxb.

Annual (or biennial), mostly erect herbs of open wet places, glabrous (calyx glabrous or hairy), branches ± quadrangular. Leaves decussate, sessile, 1-nerved. Inflorescences dichasial, (1–)3–many-flowered, sessile or peduncled; bracteoles 2, minute. Flowers actinomorphic, 4(–6)-merous, calyx tube (hypanthium) campanulate or urceolate, 4–8-nerved, epicalyxlike appendages obvious, or minute or absent, sepals (calyx lobes) short; petals absent or small, fugacious; stamens 4(–8), inserted in the lower half of the calyx tube, episepalous, included or exserted; ovary incompletely (1–)2–4(–5)-locular, placen- tas axile (but because of thin incomplete septa in fruit mostly showing up as central), in A. dichotoma perietal; style shorter or longer than ovary; disc absent. Capsule (sub)globose, thin-walled, not transversely striate, irregularly transversely rupturing. Seeds numerous, concave-convex, angular, 0.3–0.5 mm long.