Thunbergia gregorii

Classification System: APG IV

Superregnum: Eukaryota
Regnum: Plantae
Cladus: Angiosperms
Cladus: Eudicots
Cladus: Core eudicots
Cladus: Asterids
Cladus: Lamiids
Ordo: Lamiales

Familia: Acanthaceae
Subfamilia: Thunbergioideae
Tribus: Thunbergieae
Genus: Thunbergia
Subgenus: T. subg. Parahexacentris
Species: Thunbergia gregorii
Name

Thunbergia gregorii S.Moore, 1894.
Synonyms

Thunbergia aureosetosa Mildbr.
Thunbergia exasperata Lindau
Thunbergia longepedunculata Wildem.

Distribution
Native distribution areas:
References

African Plants Database 2009. Conservatoire et Jardin botaniques & South African National Biodiversity Institute. 2010 Jan 20 [1].

Moore, S. 1894. Journal of Botany, British and Foreign. London 32: 130.
USDA, ARS, Germplasm Resources Information Network. Thunbergia gregorii in the Germplasm Resources Information Network (GRIN), U.S. Department of Agriculture Agricultural Research Service. Accessed: 07-Oct-06.

Vernacular names
English: orange clock vine

Thunbergia gregorii, commonly known as orange clockvine or orange trumpet vine, is a herbaceous perennial climbing plant species in the family Acanthaceae, native to East Africa and sometimes cultivated as an ornamental vine. The bright, pure all-orange flowers distinguish it from the related black-eyed Susan vine (Thunbergia alata).[1]

Spencer Le Marchant Moore described the species in 1894, naming it after John Walter Gregory.[1] Within the genus Thunbergia, it is most closely related to T. alata, the two being placed in the subgenus Parahexacentris.[2] The common name of clockvine relates to the vine spiralling upwards in a clockwise direction.[1]

Thunbergia gregorii is an evergreen vine that grows to 8–10 ft. tall, or if left without support can become an extensive groundcover. It looks like the related black-eyed Susan vine (T. alata), but without the black eye.

Thunbergia gregorii is native to east Africa, and is pollinated by bees.[2]

Hardy to -1 C, Thunbergia gregorii flowers more profusely and even year-round in warmer climates, while restricted to summer and autumn in cooler climates.[3] It has received the Royal Horticultural Society's Award of Garden Merit. [4]

Propagation is by cuttings taken in the summer.[1]
References

Armitage, Allan M. (2011). Armitage's Vines and Climbers: A Gardener's Guide to the Best Vertical Plants. Timber Press. p. 193. ISBN 9781604692891.
Schönenberger, Jürg (1999). "Floral structure, development and diversity in Thunbergia (Acanthaceae)". Botanical Journal of the Linnean Society. 130 (1): 1–36 [10–11]. doi:10.1111/j.1095-8339.1999.tb00779.x.
Mathias, Mildred E. (1985). Flowering Plants in the Landscape. University of California Press. p. 126. ISBN 9780520054141.

"Thunbergia gregorii". www.rhs.org. Royal Horticultural Society. Retrieved 5 March 2021.

External links
"Thunbergia gregorii", East African Plants: A Photo Guide, retrieved 27 March 2015