Boehmeria densiflora var. boninensis

Wilmot-Dear, C. M. & Friis, I., 2013, The Old World species of Boehmeria (Urticaceae, tribus Boehmerieae). A taxonomic revision, Blumea 58 (2), pp. 85-216 : 138

1. Leaf length 2–2.5(–3) × width. — Ryukyu and Bonin Islands........................... b. var. boninensis a. var. densiflora — Fig. 15h–o ; Map 17

Boehmeria platyphylla D.Don var. loochooensis Wedd.(1869) 213. ― Boehmeria penduliflora Wedd. var. loochooensis (Wedd.) W.T.Wang in Wang & Chen (1995) 355. ― Type: Wright 303 (holo K), Japan, Ryukyu Islands [Loo Choo Islands].

Boehmeria weddelliana S. Vidal (1886) 256. ― Type: Vidal 1784 (iso A, K, L, PNH), Philippines, northern Luzon, Bontoc.

Stipules only 5–6 mm long. Leaves narrowly ovate to linear-ovate, small or medium 6–12(–16) by (1–) 1.5–4 cm, length 4–5(–7) × width (sometimes only 3.2–3.5 × width in Taiwan), marginal teeth acute, only 0.3–0.7 mm long and wide-spaced, 3–6 mm apart, with width 7–more than 10 × length (or sometimes reduced to minute hard mucro); leaf apex of ‘larger’ leaves gradually tapering attenuate or very indistinctly acuminate and often sideways-curved, or acute but extreme tip abruptly long-mucronate; ‘smaller’ leaves relatively slightly broader and less tapering, narrowly to broadly acute; basal veins extending almost to tip, upper lateral veins 2 – 3, all arising in distal half or in distal third of lamina; tertiary venation mostly indistinct; texture thin- or thick-chartaceous (if thick then leaves often slightly bullate). Inflorescence-bearing axes unbranched, male axes often arising mainly from lower axils, female axes (1.5–) 5–10(–18) cm. Fruiting perianth with apex ± truncate, without beak or abruptly slightly constricted at apex into minute beak, 0.1–0.2 mm long (apical teeth clearly visible), base gradually long tapering; indumentum spreading, abundant but minute and inconspicuous.

Distribution ― Throughout the range of the species except Bonin Islands.

Habitat & Ecology ― As for the species as a whole.

Conservation status ― See under the species as a whole.

Notes ― See under the species as a whole.

Figures

Map 17 Distribution of Boehmeria densiflora Hook. & Arn. var. densiflora.

Fig. 15 a–g: Boehmeria penduliflora D.G.Long. a. Leaf; b. leaf, detail of margin and adaxial surface; c. detail of abaxial surface; d. stipule; e. detail of inflorescence-bearing axis with male flower-cluster (inflorescence); f. detail of inflorescence-bearing axis with female flower-cluster (inflorescence); g. fruiting perianth. — h–o: Boehmeria densiflora Hook. & Arn. var. densiflora. h. Habit of stem with inflorescence-bearing axes; i. leaf; j. detail of leaf margin and adaxial surface;k. detail of abaxial surface; l. stipules; m. detail of inflorescence-bearing axis with male flower-cluster (inflorescence);n. detail of inflorescence-bearing axis with female flower-cluster (inflorescence); o. fruiting perianth (a-d: Strachey & Winterbottom 7; e-g: Boyce 842; h-l: Furuse 4743; m, n: Furuse 5404; o: Woo 13744; all K). — Scale bars: a, h, i = 2 cm; b, c, j, k = 5 mm; d, l = 2 mm; e-g, m-o = 1 mm.