Flora of North America species comparison

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Grevillea robusta

silkoak, silky oak
Habit Trees 8–40 m, bark fissured.
Leaves

10–34 × 9–15 cm;

blade with 11–24(–31) primary lobes, margins of primary lobes entire or 2–5-lobed, sometimes with tertiary division; ultimate lobes oblong to elliptic or subtriangular, 0.5–5 × 0.2–1 cm, margins slightly recurved, surfaces subsericeous to subvillous abaxially, glabrous adaxially.
Inflorescences

erect, sometimes on relatively short, lateral leafy shoots;

branches 24–154-flowered, secund, acropetal, 12–16 cm.
Pedicels

7.5–16 mm.
Flowers

acroscopic;

receptacle oblique;

perianth usually golden yellow to orange, rarely reddish, sometimes with red blotches inside, glabrous;

pistil 21–29 mm, glabrous;

ovary stipitate;

style yellow-orange;

pollen presenter erect, conical.
Seeds

compressed, 8–12 × 4–6 mm.
Follicles

compressed, ellipsoidal to ovoid, 12–16 mm, glabrous.

Grevillea robusta
Phenology Flowering Mar–Jul.
Habitat Disturbed sites.
Elevation 0–100 m. (0–300 ft.)
Distribution
from FNA
CA; FL; Australia [Introduced in North America; introduced also in West Indies, s Africa, Pacific Islands]
[BONAP county map]
Discussion

Grevillea robusta is native to the coast and coastal ranges of southeastern Queensland and northeastern New South Wales, Australia. The plants usually grow in basaltic soils in three distinct habitats: riverine gallery rainforest and rainforest margins; riverine sclerophyll communities with Casuarina cunninghamiana; and Araucaria forest and vine thickets on higher slopes.

Grevillea robusta is cultivated as an ornamental for its fernlike foliage and spectacular, bird-attracting flowers, in agroforestry for timber and firewood, and as a shade tree in tea and coffee plantations (C. E. Harwood 1989, 1992). Some people have been reported to develop acute contact dermatitis after being exposed to sawdust of G. robusta (J. G. B. Derraik and M. Rademaker 2009).

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 10.
Parent taxa Proteaceae > Grevillea
Name authority A. Cunningham ex R. Brown: Suppl. Prodr. Fl. Nov. Holl., 24. (1830)
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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