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Peripheralibus Suffulta. Stipulae in Basi Petioli Insertae, Inferiore Liguliformes, C

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Notes on Canarium (Burseraceae) inthe SolomonIslands P.W. Leenhouts AN INTERESTING NEW CANARIUM FROM THE SOLOMONS Canarium liguliferum Leenh., sp. nov. — Fig. 1. Arbor alta. c. 13 m Ramuli c. 8 mm diam. dense ferrugineo-puberuli, glabrati; medulla fasciculis vasorum multis pro parte peripheralibus suffulta. Stipulae in basi petioli insertae, inferiore liguliformes, c. 1 cm longae, parte angustate et ± applanata, c. 5 mm longa, Folia parte superiore ovata, c. 5 mm longa, 3 mm lata. 3- vel 4-jugata, c. 40 cm longa; sicut rhachis breviter laterales petiolus c. 9 cm longus, et petioluli sparse pilosus; petioluli terminalis folioli sub- 1–1¼ cm longi; petiolulus 3 —4½ cm longus; lanceolato-ovati, in subtus in nervis convexi, 20—22 cm longi, 5 —7 cm lati, chartacei, supra costa, costa, venisque subdense breviter ferrugineo-pilosi; basi oblique rotundata; margine paullo acumine revoluta et integra; apice gradatim acuminato, acuto c. 1 cm longo; costa subtus latere nervis vel subtrans- supra prominula, prominente, utroque c. 20 patentibus curvatis, versis, paullo praeter marginem abrupte arcuato-conjunctis, supra planis, subtus prominulis, venis utrinque reticulato-prominubs. Infructescentiae axillares, ad ramulis lateralibus ad anguste thyrsoideae, usque 9 cm longae, transversis, usque 1 cm longis, cymas 1—3-floras gerentibus; calyces fructigeri infundibuliformes, trilobati, ¾ cm diam., disco trilobato denseque ciliato. Fructus (immaturi) fusiformes, sectione transversa rotundati vel triangulati, 2¾ cm longi, 1¼ cm diam., parte apicali dense pilosa valvis loculis excepta glabri; pyrena laevis, c. 2 mm crassis, 3 aequalibus. m 1.20 with to cm thick buttresses. Tree, c. 13 high, girth —1.50 m, up c. 75 high Branchlets c. 8 mm thick, densely appressed ferruginous hairy, late glabrescent; pith with several vascular strands, partly arranged in a peripheral cylinder, the central ones either scattered or partly forming a second cylinder; central pith apparently rather soon dis- attached at or the base of the appearing. Leaves 3—5-jugate. Stipules on petiole, spoon- shaped, about 1 cm long, the lower half parallel-sided, narrow, flattish, grading into the narrowly ovate blade which is c. 5 by 3 mm. Petiole terete but for the slightly flattened base, 8—12cm long,rather densely short-hairy as are the rachis and the petiolules; lateral mm terminal lanceolate petiolules 7—12 long, one 3—4 cm. Leaflets -ovate, slightly convex, 20—22 by 5—7 cm, chartaceous, rather densely ferruginous short-hairy, above mainly on the midrib, beneath moreover on all nerves and veins; base ± rounded, oblique; margin entire, slightly revolute; apex tapering acuminate, acumen c. 1 cm long, slender, acute; midrib slightly raised above, strongly so beneath, nerves about 20 per bent and side, spreading to nearly transverse, slightly curved, strongly distinctly joined quite near the margin, hardly prominent to slightly sunken above, prominulous beneath, raised reticulation sloghtly on both sides. Inflorescences (only known) axillary, narrowly lateral branches to terminated thyrsoid, 8 cm long, nearly transverse, up 1 cm long stalked, by a 3 - or 2-flowered cyme, short-hairy, glabrescent; bracts caducous; pedicels c. 3 mm. Flowers these closed. outside rather only buds known, ellipsoid, Calyx 3½ mm high, densely appressed short fulvous-hairy, inside densely appressed hairy. Corolla in bud c. 164 BLUMEA VOL. XIII, No. i, 1965 a. b. leaf bases and Fig. 1. Canarium liguliferum Leenh. — Fruiting twig (x 2/5); part of twig with stipules of tube from inside 8); d. disk and longitudinal section (x 4/5); c. part staminal (x pistillode in flower, cross-section natural inflorescence (X 8); e. fruit, (about size); f. (x 2/5) (a, b, and e from BSIP 5365; c, d, and f from BSIP 5366). Notes P. W. LBENHOUTS: on Canarium (Burseraceae) in the Solomon Islands 165 Stamens 4 mm, outside densely appressed hairy the margin and the base excepted. 6; filaments glabrous, in bud less than halfway up connate; anthers 2 mm long, connective hooked at the Disk mm the thickened slightly apex. obovoid-cylindrical, 1½ high, upper half in- and outside pilose; pistillode c. ½ mm. Infructescences up to c. 9 cm long; with calyx funnel-shaped, 3-lobed, ¾ cm diam., a 3-lobed, ciliate disk. Fruits (not yet fully developed) spindle-shaped, in cross-section orbicular to triangular, 2¾ by 1¼ cm, rather kernel near the apex densely hairy, furthermore glabrous; smooth, lids c. 2 mm thick, all 3 cells equally well developed. SOLOMON ISLANDS. I. SE. BSIP Rob Roy ofChoiseul: Whitmore's collectors 5365 (L, type), yfr. 11-3 -1964, and 5366 (L), (J buds 11-3-1964. Ecology. Ridge top, alt. 35 m; well drained primary forest. Notes. 1. The systematic position of this new species is the first point of special interest. and the It belongs doubtless to sect. Pimela, more especially to asperum- group. In this its be C. vrieseanum group nearest relatives seem to on one side (Philippines, Celebes) somewhat celebicum Celebes and more remote C. acutifolium (especially var. from and var. aemulans from New Guinea, New Britain, and the Solomons), on the other side C. vanikoroense(New Hebrides, Fiji) and slightly more remote C. chinare (E. New Guinea, alliances Admirality Is, Solomons). These place C. liguliferum among the more primitive of characters the members of the asperum-group. Indeed, some its are among most primitive in this group: the stipules (see note 2), the presence of a tiny pistillode in the (J flowers, the fruits with 3 about equally well developed cells (the number of seeds could be established these advanced characters this relation- not yet in immaturefruits). More in the the ship are connate stamens and possibly hollow twigs. After thus the — which having put C. liguliferum in its proper place in system a place the with — worth by way is quite good in accordance its geographical position it seems into the its while to go somewhat further systematical position and geography of alliance. this link with former reflections the mutual as of In I up my on relationships part my revision I of the genus (Blumea 9, 1959, especially pp. 323—324 and fig. 13). There a derivation of the from the oleosum- proposed asperum-group group, more especially stressing the apparent relationship between C. vrieseanum and C. balsamiferum, the latter the of the The being probably most primitive species oleosum-group. area of distribution of C. balsamiferum is disjunct (Sumbawa, Celebes, Moluccas, Milne Bay Distr. of E. New Louisiada is the of Guinea, Is); the gap bridged, however, by cohering area distribution of the related These — ofdistribution closely C. oleosum. facts the areas ofits most primi- tive — E. Guinea species may point to Malesia (Celebes, Moluccas, New and some Sunda the of the adjacent islands, eastern Lesser Is) as old centre oleosum-group. The in members scattered the my opinion most primitive of the asperum-group are along borders the latter also of that same area: Celebes ((C. acutifolium var. celebicum, C. vrieseanum, in the Solomon Philippines), Is ((C. liguliferum), the slightly more derived C. acutifolium var. aemulans known from some scattered localities in the north and east of New Guinea from relic-areas and New Britain. Apparently, they occupy nowadays, the gap being ' fdled and the widened the forms up, total area by 'youn ger with the more derived characters. The C. its 2. stipules of liguliferum are most distinctive and most interesting character. They throw a new light on the possible derivation (or one of the derivations possible?) ofthesubulate of Pimela. former revision stipules sect. In my (Blumea 9,1959) Iconcluded, p. 281, that the stipules in this section are derived from a lower pair of leaflets, more in special from the petiolules of these leaflets. This conclusion was reached mainly by the 166 BLUMEA VOL. Xffl, No. i, 1965 the the study of some abnormalities and by comparison with 'foliolar pseudo-stipules' But this is first of C. decumanum, Dacryodes laxa, and Garuga spp. the case which comes that with the of reduced leaflets to my knowledge stipules appearance strongly complete seem to be normal in a species of this section (the systematic position of C. decumanum, and hence its meaning for the comparative morphology, is uncertain; it seems to be a relic-species). Moreover, it casts a new light on the, hitherto not well understandable, flattened and ribbon- or tongue-shaped stipules of C. chinare and vanikoroense, and, to lesser C. vrieseanum. These the in the evolution from a degree, may represent next step normal leaflet to really subulate stipule. NEW DELIMITATION OF CANARIUM VITIENSE A. GRAY Among the Canariums collected by the Forestry Department, Honiara, Solomon Islands, which I received occasionally for identification, several were namedby me either chinare aemulans Canarium Grutt. & H. J. Lam, or C. acutifolium (DC.) Merr. var. (Laut.) Leenh., though in either case with some hesitation. A new careful study of the whole set of specimens revealed that they are all closely alike, distinctly different from both however. there their species mentioned, As was no reason to doubt belonging to the asperum-group of sect. Pimela, I compared these specimens with the other species of that The allies turned be C. smithii Leenh. from the Is and C. schlechteri group. nearest out to Fiji Laut. from E. New Guinea and the Bismarck Archipelago. The materialfrom the Solomon well Is bridges the gap between these two as geographically as morphologically. In fact, the delimitation to both sides is vague, and the differences between the two 'species' turned characterize variation. out to only the ends of a range of clinal from from Two more species, C. vitiense A. Gray Fiji and C. samoense Engl, Samoa known delimited This and Tonga, were already to be only vaguely against C. smithii.
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