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Xanthostemon umbrosus

Family

Myrtaceae

Botanical Name

Xanthostemon umbrosus (A.Cunn. ex Lindl.) Peter G.Wilson & J.T.Waterh.

Wilson, Peter G. & Waterhouse, J.T. (1982) Australian Journal of Botany 30: 444. Type: ?.

Synonyms

Tristania umbrosa A.Cunn. ex Lindl., Bot. Reg.: 1839(1836), Type: Western Australia, Shores of York Sound, A. Cunningham 16 sept. 1820; holo: CGE; iso: BM, K. Metrosideros tetrapetala F.Muell., Fragm. 7: 41(1869), Type: Qld, Cave Creek, Gilbert River, Daintree; lecto: MEL63313. Fide Wilson (1990). Nania tetrapetala (F.Muell.) Kuntze, Revisio Generum Plantarum 1: 242(1891), Type: ?.

Stem

Fine, pale brown brittle stripes in the blaze.

Leaves

Oil dots visible with a lens if not visible to the naked eye. About 1-6 oil dots per reticulation. Leaf blades about 5-8 x 2-4.5 cm. Midrib projecting beyond the end of the leaf blade as a small point. Terminal buds and young shoots densely clothed in short, erect, brown or ginger hairs.

Flowers

Inflorescence appears terminal but is not strictly so. Calyx tube (hypanthium) and lobes clothed in short ferruginous hairs. Petals glabrous, about 5-10 x 5-10 mm, abruptly narrowed into a claw, about 1.5 mm wide. Staminal filaments about 12-14 mm long, anthers with a large oil gland at the tip of the connective. Style about as long as the stamens.

Fruit

Fruits +/- globular, about 10-12 mm diam., calyx lobes persistent at the base. Seeds about 5 x 3.5 mm.

Seedlings

Cotyledons +/- reniform, about 4 x 7 mm, oil dots visible with a lens. At the tenth leaf stage: leaf blade elliptic, both upper and lower surfaces clothed in pale, +/- tortuous hairs; oil dots visible with a lens; stem clothed in pale, erect, hairs.

Distribution and Ecology

Endemic to Australia, occurs in WA, NT, CYP and NEQ. Altitudinal range from sea level to 300 m. Grows in dry rain forest, monsoon forest and beach forest but is probably most characteristic of scrubby vegetation in crevices and gorges in sandstone.

WA

X

NT

X

CYP

X

NEQ

X

Tree

X

RFK Code

629