Anisophyllea borneensis Li Bing Zhang, Xin Chen & H.He, 2015

Chen, Xin, He, Hai & Zhang, Li-Bing, 2015, A monograph of the Anisophylleaceae (Cucurbitales) with description of 18 new species of Anisophyllea, Phytotaxa 229 (1), pp. 448-450 : 448-450

6. Anisophyllea borneensis Li Bing Zhang, Xin Chen & H.He , sp. nov. ( Figure 12 )

Type :— MALAYSIA. Sarawak: 02°40’00”N 113°50’00”E, below 500 m, 22 August 1958, M. Jacobs 5245 (holotype K-2008/ 0021895!, isotypes L-0520549!, US-2377442!) .

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MONOGRAPH OF ANISOPHYLLEACEAE

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Diagnosis:— Anisophyllea borneensis is most similar to A. dinghoui Li Bing Zhang, Xin Chen & H.He in leaves often more than 7 cm long and densely glandular with glands 0.06–0.60 mm distant, but the former has leaves less than 11 cm long, main longitudinal veins distinctly depressed adaxially, flower solitary on rachis, sparsely glandular and pubescent outside receptacle.

Trees 15–20 m tall, ca. 25 cm in diam.; young branches pannose with appressed hairs ca. 0.25 mm long, and concurringly pubescent with patent hairs to 0.16(–0.5) mm long, glandular with transparent protuberant glands, turning glabrescent and lenticellate when mature with projected orbicular lenticels; buds pannose and farinose. Leaves dimorphic, internodes between similar types of leaves 1.2–2.7 cm, between two adjacent different types of leaves 2–5 mm; small leaves caducous, only leaving scars on young twigs; large leaves petiolate, petiole 3–5 mm long, ca. 0.6 mm in diam., pannose and glandular; leaf blade elliptic or ovate-lanceolate, 7.0– 10.5 cm long, 2.0– 4.5 cm wide, base slightly oblique, cuneate, apex acute or acuminate, to 1 cm long, margins often slightly revolute, thinly coriaceous, sparsely pannose on both surfaces with indumentum relatively denser along main veins (and concurringly pilose with appressed hairs) abaxially, densely glandular on both surfaces with transparent protuberant glands 0.06–0.16 in diam., 0.06–0.30 mm distant; main longitudinal veins 5–7, springing from blade base, inner 1–2 lateral veins often merged with midrib to 1.2 cm above blade base before separated, innermost veins (midrib and its adjacent two lateral veins) bold, distinctly impressed adaxially and raised abaxially, outer 2–4 veins much thinner, outermost two veins very fine and usually disappearing into blade margins if 7 lateral veined present, slightly prominent on both surfaces; transverse veins sub-parallel or irregular, at angles of 55–65° with midrib; veinlets reticulate, tessellate and slightly prominent on both surfaces. Inflorescence a spike, axillary, supra-axillary or at base of young branches, in serials and usually branched at base; rachis to 8.5 cm long, 0.3–0.8 mm in diam., densely pannose and pubescent with hairs 0.13–0.25 mm long, remotely flowered with floral internodes 1–5 mm distant; bracts deltoid, to 1 mm long, 0.5 mm wide at base, pannose, margins ciliate; flowers polygamous, usually 4-merous, rarely 5-merous; green proximally, yellowish distally, pannose and sparsely glandular outside (with transparent protuberant glands); bisexual flowers, ca. 3.2 mm long, sessile or almost so; receptacle obovate, 1.0– 1.3 mm long, same in diam.; sepals deltoid, 1.3–1.9 mm long, 1.1–1.5 mm wide at base, margins ciliate; petals oblong, 0.7–1.0 mm long, base narrowed, 0.25–0.5 mm wide, 0.5–0.8 mm wide at apex, entire or slightly

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emarginated, sparsely glandular abaxially, margins incurved; stamens 8, filament subulate, equal in length, ca. 0.65 mm long, episepalous 4 fertile, anther subglobose, ca. 0.28 mm long, epipetalous 4 sterile, adnate to petals, anthers reduced to small dots; disk 8-lobed, crenulate; styles 4, free, ca. 0.9 mm long, base conical, base clavate, ca. 0.25 mm in diam., pubescent with brownish hairs ca. 0.03 mm long, distally attenuate, apex recurved; male flowers 1.9–2.2 mm long, smaller than bisexual flowers; shortly pedicelled, pedicel 0.3–0.5 mm long; receptacle obovate, ca. 0.5 mm long; sepals ca. 1.3 mm long; petals, stamens and disk similar to bisexual flowers; pistil rudimentary, styles 4, free, subulate, ca. 0.3 mm long, 0.1 mm wide at base. Fruits unknown.

Flowering and fruiting: —Flowering in August; fruiting time unknown.

Habitat and distribution: — In lowland rain forests; below 500 m. Indonesia (Central Kalimantan); Malaysia (Sabah, Sarawak) ( Figure 13 ) .

Taxonomic notes: — Anisophyllea borneensis is also similar to A. impressinervia in having adaxially depressed main lateral veins, from which it differs in having larger leaves with much denser glands on both leaf surfaces. The epithet is from the island of Borneo, where the type specimen was collected.

Additional specimens examined: — INDONESIA. Central Kalimantan: East Kutei, Sg. Menubar region , N. E . of Sangkulirang , 10 m, 12 June 1951, A . Kostermans 6147 ( L) . MALAYSIA. Sabah: Masuli-Koyah F. R ., 20 miles WSW of Lahad Datu , 150 m, 01 April 1955, G. H. S . Wood SAN 15468 ( L) .

Figures

FIGURE 12. Anisophyllea borneensis Li Bing Zhang, Xin Chen & H.He (M. Jacobs 5245; holotype, K-2008/0021895). —A. Flowering branch. —B. Bisexual flower. —C. Male flower. —D. Petal. —E. Petal with stamen adnate. —F. Episepalous stamen. —G. Epipetalous stamen. —H. Styles and disk of bisexual flower. —J. Styles and disk of male flower (H–J drawn by Jing Chen & Fang Cui).

FIGURE 13. Geographical distribution of Anisophyllea borneensis Li Bing Zhang, Xin Chen & H.He.