A revision of Rhapis (Arecaceae) Author Henderson, Andrew text Phytotaxa 2016 2016-04-28 258 2 137 152 http://dx.doi.org/10.11646/phytotaxa.258.2.3 journal article 10.11646/phytotaxa.258.2.3 1179-3163 13669842 11. Rhapis vidalii Averyanov, Nguyen Tien Hiep & Phan Ke Loc (2006: 12) . Type:— VIETNAM . Hoa Binh : Mai Chau district, Van Mai municipality, highway 7, 15 km post, between 20°35’N , 105°02’E and 20°34’N , 105°02’E , 300–350 m , 12 December 2002 , D. Harder, N. T. Hiep, L. Averyanov, DKH 8123 ( holotype HN n.v. , isotype LE n.v. ) Stems 1.1(0.9–1.3) m long, 0.3(0.2–0.3) cm diameter. Leaf sheath fibers coarse, flattened, forming a diagonal mesh, extended into a well-developed ligule; petioles 17.3(11.0–26.5) cm long, 1.0(0.8–1.2) mm wide at the apex; abaxial hastula usually incomplete, part of the petiole continuous with the costa; segments 7(5–9) per leaf; central segments narrowly linear, usually 1–2-veined, acuminate, the apices scarcely toothed, 16.8(14.2–22.0) cm long, 0.7(0.4–1.2) cm wide at midpoint, free almost to the base, the non-split basal part 0.3(0.2–0.7) cm; lateral segments 15.9(13.0–20.5) cm long, 0.6(0.4–1.4) cm wide at midpoint, the non-split basal part 0.3(0.2–0.4) cm; abaxial surface of segments without scales, not indumentose when first exposed. Inflorescences slender, few branched, with the first branch not as large as the rest of the inflorescence; prophyll and peduncular bract narrow, tubular, not or scarcely overlapping, the inflorescences exerted apically through the bracts on a curved peduncle; rachis 4.4(2.0–6.7) cm long; rachillae filiform, usually tomentose, especially the staminate ones; proximal rachilla 3.0 cm long, 0.3 mm wide; staminate and pistillate flowers pedicellate; staminate and pistillate corollas with poorly developed, inturned apical lobes, these not swollen internally; filaments terete; fruits globose, white, 9.1(8.9–9.3) mm long, 7.4(7.0–7.7) mm diameter, borne on a pedicelliform pistillate corolla. Distribution and habitat :—Northern Vietnam ( Hoa Binh , Thanh Hoa ) ( Fig. 5 ) in lowland forest on limestone outcrops at 647(400–800) m elevation. Taxonomic notes:— By its incomplete abaxial hastula, narrow segments, and pedicelliform pistillate corolla, Rhapis vidalii appears most similar to R. puhuongensis . It differs from this species in its segments free almost to the base.