Myrtaceae
Syzygium
Syzygium racemosum

Syzygium racemosum subsp. calcimontanum (P.S.Ashton) P.S.Ashton

First published in Tree Fl. Sabah & Sarawak 7: 274 (2011)
This subspecies is accepted
The native range of this subspecies is Borneo (Sarawak). It is a tree and grows primarily in the wet tropical biome.

Descriptions

Ashton, P. (2006). New Syzygium (Myrtaceae) from Northern Borneo. Kew Bulletin, 61(1), 107-144. Retrieved from http://www.jstor.org/stable/20443251

Type
Sarawak: G. Subis, in flower, S. Tan & E. Wright S 27274, (holotypus K!; isotypus SAR).
Morphology General Habit
Small tree, 10 m tall, 10 cm diam. Parts glabrous
Morphology Twigs
Twig c. 2 mm diam., terete, pale brown
Morphology Leaves
Leaf blade 12 - 17 x 5.5 - 7 cm, ovate, thinly coriaceous, drying purplish brown beneath, glistening mauve-brown above, without pits above more or less papillose beneath; base obtuse, petiole c. 4 mm long slender drying black; apex 1.5 cm caudate; veins unequal, main veins c. 15 pairs each with 1 - 3 shorter intermediates, very slender, slightly raised throughout, most so beneath, as also the tertiaries; intramarginal vein c. 2 mm within margin, hardly arched
Morphology Reproductive morphology Inflorescences
Panicle terminal, 3 cm long, 2-branched, terete
Morphology Reproductive morphology Flowers
Flower bud 5 x 3 mm, urceolate, slightly constricted below the 4, 1 x 2 mm shortly hemispherical sepal lobes with hyaline margins, tapering into pseudostalk, sessile; stamens many, short
Morphology Reproductive morphology Fruits
Fruit 17 mm diam., spherical, with c. 4 mm diam. raised calyx rim.
Distribution
Sarawak
Ecology
On limestone karst, at low altitude. At G. Subis it was recorded as among boulders on a slope.
Note
This species, only known from the Sarawak limestone where it occurs on rocky slopes, belongs to the jambu group; but its flowers are uncharacteristically small, while its ovate leaf blade with slender petiole is also distinctive.
[KBu]

Ashton, P. (2006). New Syzygium (Myrtaceae) from Northern Borneo. Kew Bulletin, 61(1), 107-144. Retrieved from http://www.jstor.org/stable/20443251

Type
Bau Distr., Tiang Bekap, Mt Maja, in flower, Chew Wee Leck CWL 710 (holotypus K!; isotypus SAR).
Morphology General Habit
Subcanopy tree 5 m tall Parts glabrous
Morphology Twigs
Twig 1 - 2 mm diam., slender, terete, pale brown
Morphology Leaves
Leaf blade 9- 17 x 4- 8 cm, oblong, thin, drying pink-brown, slightly glistening obscurely pitted above, dull and obscurely papillose beneath; base obtuse, abruptly terminating at 3 mm long 2 mm diam. short black drying petiole; shortly acuminate; veins unequal, main veins c. 12 pairs, spreading, somewhat unequally spaced with many shorter intermediate veins, slender but distinctly raised beneath, distinct but hardly raised above, as also the tertiary veins; intramarginal veins 1 - 2 mm within margin, slightly arched
Morphology Reproductive morphology Inflorescences
Inflorescence 3 cm long, racemose, axillary, with 2 mm long narrowly triangular bracts
Morphology Reproductive morphology Flowers
Flower bud 5 x 3 mm, shortly club shaped, tapering into indistinct c. 2 mm long pseudostalk; calyx lobes 4, c. 2 x 2 mm, ovate, broad, hyaline, clasping with corolla only exposed at apex.
Distribution
Knowni from the single collection, from W Sarawak
Ecology
On a karst limestone hill.
Note
Apparently a member of the jambu group, the flower buds are unusually small, and too young on the only collection to establish their full character. The leaf shape and venation can alone distinguish the species.
[KBu]

Sources

  • Herbarium Catalogue Specimens

    • Digital Image © Board of Trustees, RBG Kew http://creativecommons.org/licenses/by/3.0/

  • Kew Backbone Distributions

    • The International Plant Names Index and World Checklist of Vascular Plants 2024. Published on the Internet at http://www.ipni.org and https://powo.science.kew.org/
    • © Copyright 2023 World Checklist of Vascular Plants. http://creativecommons.org/licenses/by/3.0

  • Kew Bulletin

    • Kew Bulletin
    • http://creativecommons.org/licenses/by-nc-sa/3.0

  • Kew Names and Taxonomic Backbone

    • The International Plant Names Index and World Checklist of Vascular Plants 2024. Published on the Internet at http://www.ipni.org and https://powo.science.kew.org/
    • © Copyright 2023 International Plant Names Index and World Checklist of Vascular Plants. http://creativecommons.org/licenses/by/3.0