Two new species of Acronychia from New Guinea,. glauca Hartley and A. loisseliana Hartley, are described and illustrated

Hartley, T. G.

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Two   new   species   of   Acronychia  from   New   Guinea,   A.   glauca Hartley and A. loisseliana Hartley,  are described and  illustrated.<br /

T. G. Hartley

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TWO NEW SPECIES OF ACRONYCHIA (RUTACEAE)  FROM NEW GUINEA

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REINWARDTIAPublished by Herbarium Bogoriense — LBN, BogorVol. 10, P a r t i , pp. 93 - -96 (1982)TWO NEW SPECIES OF ACRONYCHIA (RUTACEAE) FROMNEW GUINEA *T. G. HARTLEYHerbarium Australiense, C.S.I.R.O. Division of Plant Industry, Canberra,A.C.T. 2601, AustraliaABSTRACTTwo new species of Acronychia from New Guinea, A. glaucaHartley and A. wisseliana Hartley, are described and illustrated.ABSTRAKDua jenis baru Acronychia dari Irian, A. glauea Hartley and A.wisseliana Hartley dipertelakan dan digambar.Since the publication of a revision of Acronychia (Hartley, 1974),I have examined a number of additional collections of the genus. Amongthese are the following two new species from New Guinea.Acronychia glauca Hartley, sp. nov. — Fig. 1 a, b.Frutex 0.5 m altus; ramulis glabris, manifeste glaucis; foliis uni-foliolatis; petiolo glabro, manifeste glauco, 0.2—0.5 cm longo; foliolocoriaceo, glauco (praecipue in costa), elliptico. 2—3.5 cm longo, 1—1.8cm lato, basi acuto vel cuneato, apice obtuso vel obtuse acuminato, acumineusque 0.5 cm longo, venis primariis utrinsecus costae 6—9; inflorescentiisunifloris, 0.8-—1 cm longis, axe puberulo, mox glauco, pedicello subtilitei-adpresse pubescenti, ca 2 mm longo; floribus ca 4 mm longis; sepalissubtiliter adpresse pubescentibus, rotundatis, 0.6—0.8 mm longis, 1.2—1.4mm latis; petalis abaxialiter adpresse pubescentibus, adaxialiter glabris;disco glabro, ca 0.2 mm alto, 1.2 mm lato; ovario dense pubescenti, sinefissuris septicidalibus; stylo glabro; fructibus non visis. Holotypus:Sleumer & Vink BW 14188 (CANB).A proposal to conserve the generic name Acronychia J.R. & G. Forster againstJambolifera L. (Hartley in Taxon 23: 435-437. 1974). was accepted by theLA.P.T. Committee on Spermatophyta (Taxon 24: 247. 1975), and has beenincorporated into the most recent edition of the International Code of BotanicalNomenclature (Reg. Veg. 97. 1978).94 R E I N W A R D T I A [VOL. 10Shrub 0.5 m high; branchlets glabrous, manifestly glaucous. Leavesunifoliolate; petiole glabrous, manifestly glaucous, 0.2—0.5 cm long;leaflet coriaceous, glaucous (mainly on the midrib), elliptic, 2—3.5 cmlong, 1—1.8 cm wide, the base acute to cuneate, the apex obtuse toobtusely acuminate, the acumen to 0.5 cm long, the main veins 6 to 9on each side of the midrib. Inflorescences 1-flowered. 0.8—1 cm long;axis puberulent, soon becoming glaucous; pedicel finely aporessed pubes-cent, about 2 mm long. Flowers about 4 mm long; sepals finely appressedpubescent, rounded, 0.6—0.8 mm long, 1.2—1.4 mm wide; petals appressedpubescent abaxially, glabrous adaxially; disc glabrous, about 0.2 mmhigh, 1.2 mm wide; ovary densely pubescent, without septicidal fissures;style glabrous. Fruits not seen.DISTRIBUTION: Known only from the type collection.IRIAN JAYA. Vogelkop Peninsula: Arfak Mountains, Angi Lakes, AngiGita Lake, Mt. Sensenemes, common in open fire-vegetation with low scrub, 2400 m,Sleumer & Vink BW U188 (CANB, holotype).This species appears to be most closely related to Acronychia arfu-kensis Gibbs, which is known only from Mt. Koebre, Arfak Mountains.The main differences between the two are that here the branchlets andpetioles are strongly glaucous and the ovary is entirely pubescent whereasin A arfakensis these vegetative parts are not noticeably glaucous andthe ovary is entirely glabrous or with a few hairs only at the apex.Acronychia wisseliana Hartley, sp. nov. — Fig. 1 c-f.Frutex(?); ramulis glabris, mox suberosis; foliis trifoliolatis (foliisinfrequentibus unifoliolatis) ; petiolo glabro, 0.4—1.4 cm longo; foliolissubcoriaceis vel coriaceis, glabris, ellipticis vel elliptico-oblongis, 1.8—3.5cm longis, 0.8—1.5 cm latis, basi acutis vel cuneatis, apice obtusis velretusis, venis primariis utrinsecus costae 8—10; inflorescentiis uniflorisvel paucifloris, 1.2—3 cm Iongis, axe et ramis glabratis, pedicellis subtiliteradpresse pubescentibus, 3.5—4 mm longis; floribus 6.5 mm longis; serai'sglabratis, rotundatis 0.5—0.7 mm longis, 0.8—1 mm latis; petalis abaxi-aliter subtiliter adpresse pubescentibus, adaxialiter glabris; disco glabro,0.6 mm alto, 1.3 mm lato; ovario glabro, fissuris scoticidalibus ca 1/8longitudine extensis; stylo basin versus pubescenti, aliter glabro; fruc-tibus in sicco rubiginosis glabris, fissuris septicidalibus ca 1/3 longi-tudine extensis, subglobosis, ca 8 mm latis, basi et apice rotundatis;epicarpio in sicco ca 1.5 mm crasso, mesocarpio subligneo; endocarpiocartilagineo; seminibus nigricantibus, ca 3 mm longis. Holotypus:Eyma 4802 (BO).Shrub(?); branchlets glabrous, soon developing cork tissue. Leavestrifoliolate (occasional leaves unifoliolate) ; petiole glabrous, 0.4—1.4 cmlong; leaflets subcoriaceous to coriaceous, glabrous, elliptic to elliptic-oblong, 1.8—3.5 cm long, 0.8—1.5 cm wide, the base acute to cuneate, the1982] HARTLEY: New Acronyehia6 mm.FIG. 1. New species of Acronyehia. a, b, A. glauca Hartley: a, flowering branchlet;b, flower with one petal and three stamens removed (both drawn from Sleumer &Vink BW 14188). c-f, A, wisseliana Hartley: c, flowering branchlet; d, flower withone petal and three stamens removed; e, fruit; f, fruit in diagrammatic cross sectionshowing outer fleshy exocarp, subwoody mesocarp (stippled), and the four locules,one containing a seed showing seed coat (hatched) and embryo surrounded by endos-perm (all drawn from Eyma 4802).96 REINWARDTIA tVOIi ilOapex obtuse to retuse, the main veins 8 to 10 on each side of the midrib.Inflorescences one to few-flowered, 1.2—3 cm long; axis and branchesglabrate; pedicels finely appressed pubescent, 3.5—4 mm long. Flowers6.5 mm long; sepals glabrate, rounded, 0.5—0.7 mm long, 0.8—1 mmwide; petals finely appressed pubescent abaxially, glabrous adaxially;disc glabrous, 0.6 mm high, 1.3 mm wide; ovary glabrous, with septicidalfissures extending for about one third the length; style pubescent towardthe base, otherwise glabrous; Fruits drying reddish brown, glabrous,with septicidal fissures extending for about one third the length, sub-globose, about 8 mm wide, the base and apex rounded; epicarp dryingabout 1.5 mm thick, the mesocarp subwoody; endocarp cartilaginous.Seeds blackish, about 3 mm long.DISTRIBUTION. Known only from the type collection.IRIAN JAYA. Wissel Lake region, Enarotali-Koegapa, heath vegetation Ego-gitoagapa [elevation probably about 1800 m] Eyma 1802 (BO, holotype).This species appears to be most closely related to AcronycMa trifolio-lata Zoll. & Mor. var. trifoliolata — a generally more lowland plant whichranges from Java and Christmas Island east, discontinuously, to theSolomon Islands — from which it differs mainly in having shorter peti-oles, smaller leaflets, and usually smaller inflorescences. Also, thebranchlets here have well developed cork tissue, a feature I have notseen in any of the other species of AcronycMa.LITERATURE CITEDHARTLEY, T. G. (1974). A revision of the genus AcronycMa (Rutaceae). In J. ArnoldArb. 55: 469—523, 525—567.

TWO NEW SPECIES OF ACRONYCHIA (RUTACEAE) FROM NEW GUINEA

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