Gelrebia
| Notice: | This page is derived from the original publication listed below, whose author(s) should always be credited. Further contributors may edit and improve the content of this page and, consequently, need to be credited as well (see page history). Any assessment of factual correctness requires a careful review of the original article as well as of subsequent contributions.
If you are uncertain whether your planned contribution is correct or not, we suggest that you use the associated discussion page instead of editing the page directly. This page should be cited as follows (rationale):
Citation formats to copy and paste
BibTeX: @article{Gagnon2016PhytoKeys, RIS/ Endnote: TY - JOUR Wikipedia/ Citizendium: <ref name="Gagnon2016PhytoKeys">{{Citation See also the citation download page at the journal. |
Ordo: Fabales
Familia: Leguminosae
Name
Gelrebia E. Gagnon & G. P. Lewis gen. nov. – Wikispecies link – Pensoft Profile
Diagnosis
Gelrebia is morphologically similar to Caesalpinia s. s. but the two genera differ somewhat in habit, with Gelrebia species being erect to scrambling shrubs (vs. erect shrubs or small trees), in having dark pinkish mauve to light pinkish-white flowers (vs. flowers that are variable in colour, from yellow, white, red and orange to green), and coriaceous, broadly oblong-ovoid to obliquely pyriform pods, with a large, oblique, rounded base (vs. coriaceous, oblong-elliptic to linear pods, with an oblique cuneate base).
Type
Gelrebia rubra (Engl.) E. Gagnon & G. P. Lewis ≡ Hoffmannseggia rubra Engl.: Caesalpinia rubra (Engl.) Brenan
Description
Erect to scambling shrubs, 0.3–5 m tall, armed with scattered, straight or curved, deflexed prickles (these 7–20 mm long); stems puberulous to pubescent when young, glabrescent. Stipules not seen. Leaves alternate, bipinnate, ending in a pair of pinnae; pinnae opposite, in 1–17 pairs; leaflets opposite (except in Gelrebia glandulosopedicellata), in 1–33 pairs per pinna, narrowly oblong or oblong-elliptic, 3–11 × 2–5 mm, apex rounded to emarginate, sometimes mucronate, glabrous or sparsely pubescent, lower surface of the blades with numerous subepidermal glands or translucent dots (best seen with a × 10 hand lens or microscope). Inflorescence a terminal or axillary raceme, c. (1–) 2–19 (– 25) cm long, unarmed; bracts broadly ovate to suborbicular, apex aristate, 3–10 mm long, caducous. Flowers bisexual, zygomorphic; calyx comprising a short hypanthium with 5 sepals, c. 5–13 mm long, eglandular, glabrous to finely pubescent, lower sepal strongly cucullate (occasionally with a beaked apex), covering the other 4 sepals in bud before anthesis, all sepals caducous, but hypanthium persisting as a free ring around the pedicel as the pod matures; petals 5, free, dark pinkish mauve to light pinkish-white, c. 7–24 × 5–15 mm, eglandular; stamens 10, free, filaments 8–20 mm long, pubescent and eglandular; ovary glabrous. Fruit a coriaceous, broadly oblong-ovoid to obliquely pyriform pod, apex acute, with a large, oblique, rounded base, c. 15–40 × 12–23 mm, dehiscent along both sutures, glabrous to minutely pubescent, eglandular. Seeds obovoid, laterally compressed.
Geographic distribution
A genus of nine taxa in eight species, restricted to Africa, in Namibia, Botswana, South Africa, Northern Kenya, Ethiopia, and Somalia. One species also found in the Democratic Republic of the Congo (Zaire, Katanga).
Habitat
Deciduous bushland, dry woodlands, on rocky ridges, often along dry river beds, or on sandy valley floors. One species also found in degraded savanna, close to termite mounds.
Etymology
Gelreb or gelrib is the Somali name for Gelrebia trothae subsp. erlangeri (field labels of Dale K724 (“gelrib”) and of Gillett 13223 (“gelreb”) from Kenya), meaning ‘camel trap’ and clearly alluding to the robust deflexed prickles characteristic of the species, and indeed the genus as a whole, which can hinder the passage of camels.
References
Wilczek (1951)[1]; Roti-Michelozzi (1957)[2]; Brenan (1963[3], 1967[4]); Ross (1977[5]: 122–130); Thulin (1980[6], 1983[7]: 16–18; 1993[8]: 344–347); Germishuizen (1991)[9]; Roux (2003)[10]; Curtis and Mannheimer (2005[11]: 226–228); Brummitt et al. (2007)[12].
Original Description
- Gagnon, E; Bruneau, A; Hughes, C; de Queiroz, L; Lewis, G; 2016: A new generic system for the pantropical Caesalpinia group (Leguminosae) PhytoKeys, (71): 1-160. doi
Images
|
Other References
- ↑ Wilczek R (1951) Deux nouvelles espèces de Caesalpinia du Congo Belge. Bulletin du Jardin botanique de l’État à Bruxelles 21: 83–86. doi: 10.2307/3666811
- ↑ Roti-Michelozzi G (1957) Adumbratio Florae Aethiopicae: 6. Caesalpiniaceae (excl. gen. Cassia). Webbia 13(1): 133–228.
- ↑ Brenan J (1963) Notes on African Caesalpinioideae. Kew Bulletin 17: 197–218. doi: 10.2307/4118939
- ↑ Brenan J (1967) Leguminosae, part 2: subfamily Caesalpinioideae. In: Milne-Redhead E Polhill R (Eds) Flora of Tropical East Africa. Crown Agents for Oversea Goverments and Administration, London.
- ↑ Ross J (1977) Fabaceae, subfamily Caesalpinioideae. In: Flora of Southern Africa, vol. 16, no. 2. Botanical Research Institute, Department of Agricultural Technical Services, Pretoria, 1–142.
- ↑ Thulin M (1980) A new Caesalpinia (Leguminosae) from northeast Kenya. Kew Bulletin 34(4): 819–820. doi: 10.2307/4119075
- ↑ Thulin M (1983) Leguminosae of Ethiopia. Opera Botanica 68: 1–223.
- ↑ Thulin M (1993) Flora of Somalia, vol.1, Pteridophyta, Gymnospermae, Angiospermae (Annonaceae-Fabaceae). Kew Royal Botanic Gardens, Richmond, 1–1493.
- ↑ Germishuizen G (1991) Caesalpinia bracteata, a new species from the Onseepkans area of the Northern Cape Province. Bothalia 21(2): 152–154. doi: 10.4102/abc.v21i2.876
- ↑ Roux J (2003) Caesalpinia. In: Germishuizen G Meyer L (Eds) Plants of Southern Africa: An Annotated Checklist, Strelitzia 14. National Botanical Institute, Pretoria.
- ↑ Curtis B, Mannheimer C (2005) Tree Atlas of Namibia. National Botanical Research Institute, Windhoek, Namibia, 1–674.
- ↑ Brummitt R, Chikuni A, Lock J, Polhill R (2007) Leguminosae. In: Timberlake J Pope G Polhill R Martins E (Eds) Flora Zambesiaca, vol. 3(2). Kew Royal Botanic Gardens, 1–218.
