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Flora of Australia Online

Grevillea globosa C.A.Gardner, J. Roy. Soc. W. Australia 47: 55 (1964)

T: 32 km north of Pindar, W.A., Jan. 1963, F.Lullfitz 2241 ; holo: PERTH.

Illustrations: D.J.McGillivray & R.O.Makinson, Grevillea 373, fig. 93 & col. pl. (1993); P.M.Olde & N.R.Marriott, Grevillea Book 2: 178 (bottom centre), 179 (146A–C) (1995).

Regenerates from seed only.

Spreading shrub to c. 2 m high. Leaves ascending, (4–) 9–18 cm long, pinnatipartite, almost pinnatisect; lobes 3–9, ascending, linear or occasionally subterete to trigonous, 0.5–1 mm wide; margins tightly revolute against prominent midvein; lower surface 2-grooved. Conflorescence erect, on long peduncles, terminal or axillary, simple or 2-branched; unit conflorescence a dense globose head, weakly basipetal; rachis 5–8 mm long, villous. Flower colour: perianth (hairs) pale green to whitish below curve, red-brown on limb outside, inside exposed, creamy green, turning glossy black after anthesis; style greenish with white hairs. Perianth loosely tomentose to subvillous outside, pilose inside for c. 3 mm from base, glabrous above; tepals everting before release of style-end and displaying inner surface. Pistil 13–22 mm long; ovary densely villous; style villous at base, with long, scattered hairs above to near apex, exserted in late bud. Follicles erect on pedicels, obloid-ellipsoidal, 9–12.5 (–14) mm long, tomentose, subdorsally ridged, rugulose elsewhere. Fig. 39D–F.

Occurs in the northern wheatbelt of W.A., from around Lake Moore to N of Pindar. Rare, only three populations known. Grows in Mulga shrubland or mallee woodland in loam or sand. Flowers sporadically through the year, perhaps concentrated in late spring to summer. Flowers honey-scented. Map 344.

W.A.: 48 km SW of Yalgoo, J.S.Beard 3134 (KPBG, PERTH); 22 km WSW of Paynes Find on Great Northern Hwy, D.J.McGillivray & A.S.George (NSW, PERTH).

This species is recognised as 'Poorly Known' in J.D.Briggs & J.H.Leigh, Rare or Threatened Australian Plants (1995).

Grevillea globosa was regarded by McGillivray & Makinson (Grevillea 373 (1993)) and Olde & Marriott (Grevillea Book 2: 178, 179 (1995)) as a species of uncertain affinity. There is however concordance in most features with other members of the Pterosperma group, the main difference being in the much shorter subglobose conflorescences, perhaps a result of simple abbreviated rachis meristem development rather than a ancestral condition. The unit conflorescence and floral orientation are not fully regular, and there appears to be a residual tendency (at least at the base of the conflorescence) towards the transverse floral orientation that is typical of other members of the group. The seed is somewhat intermediate between the compressed type found in G. pterosperma and G. albiflora , and the spongy subhemispherical type of G. eriobotrya .

Grevillea globosa is rarely confused with G. bracteosa , which has simple-linear or rarely 2-or 3-lobed leaves, a subapically swollen style and large conspicuous persistent floral bracts 7–14 × 5–13 mm (c. 2 × 1.5–1.8 mm in G. globosa ).

(R.O.Makinson)

 

Data derived from Flora of Australia Volumes 16 (1995), 17A (2000) and 17B (1999), products of ABRS, ©Commonwealth of Australia