The species occurs in the Perth region in low-lying areas on sandy and sandy-clay soils which are generally wet in the winter.
Grevillea thelemanniana is a small, spreading shrub, that grows to between 0.3–1.5 metres (0.98–4.92 ft) high and wide. Dark green leaves are divided into narrow segments, and are 1–2 inches (2.5–5.1 cm) long.
The clusters of pink or bright red and yellow tipped flowers appear between late autumn and late spring, and can also appear in any season in garden cultivation.
A number of former subspecies of Grevillea thelemanniana are now regarded as species in their own right. They include:
- subsp. delta McGill. is now Grevillea delta (McGill.) Olde & Marriott
- subsp. fililoba McGill. is now Grevillea fililoba (McGill.) Olde & Marriott
- subsp. hirtella (Benth.) McGill. is now Grevillea hirtella (Benth.) Olde & Marriott
- subsp. obtusifolia (Meisn.) McGill. is now Grevillea obtusifolia Meisn.
- subsp. pinaster (Meisn.) McGill. is now Grevillea pinaster Meisn.
- subsp. preissii (Meisn.) McGill. is now Grevillea preissii Meisn.
- 'form e' (prostrate or grey-leaf form) is now Grevillea humifusa Olde & Marriott
Grevillea thelemanniana is cultivated as an ornamental plant, for use as a flowering open shrub in gardens and drought tolerant landscaping. There is a dwarf gray selection cultivated by plant nurseries that grows 0.5 feet (0.15 m) high by 6 feet (1.8 m) wide, now known as Grevillea humifusa.
- "Grevillea thelemanniana Hugel ex Endl". Australian Plant Name Index (APNI), IBIS database. Centre for Plant Biodiversity Research, Australian Government.
- FloraBase The West Australian Flora: Grevillea thelemanniana
- FloraBase The West Australian Flora: Grevillea thelemanniana (taxonomy)
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