Ipomoea revoluta
| 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{Wood2017PhytoKeys, RIS/ Endnote: TY - JOUR Wikipedia/ Citizendium: <ref name="Wood2017PhytoKeys">{{Citation See also the citation download page at the journal. |
Ordo: Solanales
Familia: Convolvulaceae
Genus: Ipomoea
Name
Ipomoea revoluta J.R.I.Wood & Scotland sp. nov. – Wikispecies link – Pensoft Profile
Diagnosis
Ipomoea revoluta is almost certainly related to I. malvaeoides Meisn. and its allies but is distinguished from all of these by its twining (not erect) habit and distinctly petiolate leaves. Related species in which the leaves are furnished with linear leaflets, such as I. fiebrigii O’Donell, I. itapuaensis J.R.I. Wood & R. Degen and I. theodori O’Donell, are erect herbs with sessile or near sessile leaves.
Type
BRAZIL. Mato Grosso do Sul, Serra de Maracaju, 17 Feb. 1970, G. Hatschbach 23761 (holotype MBM, isotypes CTES, F, MICH, S).
Description
Slender twining liana of unknown height; stem woody, c. 2–3 mm thick, pale brown, shortly pubescent. Leaves petiolate, digitately divided into 5–7 free leaflets; leaflets 5–9 × 0.15–0.4 cm, linear, attenuate to a mucronate apex, basally tapered, margin revolute; adaxially glabrous, midvein strongly impressed; abaxially white-tomentose, the midvein prominent, nearly glabrous; petioles 8–13 mm, thinly pubescent. Inflorescence of 1–3-flowered axillary cymes; peduncles 7–9 mm, very thinly pubescent with scattered hairs; bracteoles c. 1 mm long, scale-like, caducous; pedicels 8–10 mm long, very thinly pubescent with scattered hairs; sepals subequal, 8–10 × 6–7 mm, ovate to elliptic, acute to shortly mucronate, sericeous with narrow, scarious, glabrous margins, inner sepals white-sericeous with wider scarious margins; corolla 5–6 cm long, pink, sericeous in bud, funnel shaped from a short basal cylindrical tube, limb c. 2 cm diameter, lobes rounded; stamens unequal, filaments pilose at base only, the two longer c. 20 mm, the shorter c. 12 mm; anthers included; ovary bilocular, glabrous; style c. 20 mm, stigma bi-globose. Capsule ovoid, apiculate, c. 10 mm long (immature), glabrous, ±enclosed by the sepals.
Distribution
BRAZIL. Apparently endemic to the Serra de Maracaju in Mato Grosso do Sul, where it grows on arenite outcrops. Figure 9
Additional collection seen
Mato Grosso do Sul, G.M. Hatschbach & J.M. Silva 60724 (MBM).
Conservation status
The two collections were made at different dates from the near vicinity of each other. Field notes do not indicate the plant’s frequency and in the absence of other collections or any information about threats to its habitat, it can only be classified as Data Deficient (DD) within IUCN guidelines. It would be treated as a “black star” species within the classification of Hawthorne and Marshall (2016)[1], but again this must be considered a provisional classification as no systematic search has been made for the species at the type locality or in other suitable habitats, although it must be presumed to be rare.
Etymology
The epithet revoluta refers to the revolute margins of the leaflets.
Note
We have not been able to sequence material of this species but it is almost certainly related to I. malvaeoides and its allies, which are part of a large clade of around 70 species almost restricted to South America. Species in the clade are characterised morphologically by the pubescent exterior of the corolla and the subequal, sericeous or pubescent, ovate herbaceous sepals. The linear leaflets of I. revoluta recall those of the unrelated I. subrevoluta Choisy, with which it has been wrongly identified in many herbaria. It is easily distinguished from that species by the sericeous exterior of the corolla and the larger, abaxially pubescent sepals.
Original Description
- Wood, J; Muñoz-Rodríguez, P; Degen, R; Scotland, R; 2017: New species of Ipomoea (Convolvulaceae) from South America PhytoKeys, (88): 1-38. doi
Images
|
Other References
- ↑ Hawthorne W, Marshall C (2016) A Manual for Rapid Botanical Survey (RBS) and measurement of vegetation bioquality. Published online, June 2016. Department of Plant Sciences, University of Oxford, U.K. http://herbaria-old.plants.ox.ac.uk/rbs/
