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Eucalyptus angularis


Lesueur Phantom mallee

Eucalyptus angularis Brooker & Hopper, Nuytsia 9: 8 (1993).

T: Mt Benia, SW slope, 30
°14'S, 115°16'E, 3 Mar. 1983, M.I.H.Brooker 8013 & S.D.Hopper: holo: PERTH; iso: CANB, NSW.

Mallee to 3 m tall. Forming a lignotuber.
Bark rough for basal ca 1m of stem, grey, smooth above.
Branchlets angular; lacking oil glands in the pith.
Juvenile growth (coppice or field seedlings to 50 cm): not seen.
Adult leaves alternate, petioles 1-1.8 cm long; blade lanceolate to falcate, 5.5-10 cm long, 1.5-1.7 cm wide, base tapering to petiole, margin entire, apex pointed, concolorous, glossy, green, side-veins greater than 45° to midrib, reticulation, intramarginal vein remote from margin, oil glands island and intersectional.
Inflorescences axillary unbranched, peduncles 1-1.2 cm long; buds ?9 or 11, pedicellate, ovoid, scar absent, the single operculum conical, stamens irregularly flexed, anthers +/-reniform, versatile, dorsifixed, dehiscing by longitudinal slits that are ?not confluent apically, style long and straight, stigma tapered, locules 3, the placentae each with 2 vertical rows of ovules; flowers not seen.
Fruit not seen.
Seed not seen.
Cultivated seedling (measured at ca node 10): not grown.


NOTES

Eucalyptus angularis (Latin, angularis, angular, referring to the angled branchlets).

A mallee endemic to Western Australia and of extreme rarity, known only from a small stand near Mt Lesueur and one on Mt Benia. The stems are rough-barked to 1 m and the adult leaves short, glossy green, glandular and slightly discoloured, reminiscent of the eastern stringybarks. The plant has axillary, up to 11-flowered, inflorescences but has not been seen in flower.

Eucalyptus angularis belongs in Eucalyptus subgenus Eucalyptus, a group characterized by buds with a single operculum (hence no operculum scar) and ovules arranged in 2 rows on the placenta. Little is known of this species and its relationships within the subgenus.

Recent searches by two of the authors (AVS and JRC) were unable to relocate the plants.