Orthosiphon cinereus A.J.Paton, Paton, Alan, 2014

Paton, Alan, 2014, A new species of Orthosiphon (Lamiaceae) from Angola, Biodiversity Data Journal 2, pp. 1162-1162: 1162

publication ID

http://dx.doi.org/10.3897/BDJ.2.e1162

persistent identifier

http://treatment.plazi.org/id/FFCDB03B-E10B-9ED1-7A1E-258C36933219

treatment provided by

Biodiversity Data Journal by Pensoft

scientific name

Orthosiphon cinereus A.J.Paton
status

sp. nov.

Orthosiphon cinereus A.J.Paton   sp. nov.

Materials

Type status: Holotype. Occurrence: recordedBy: G. Barbosa; F.Moreno 9730; Location: country: Angola; stateProvince: Huila; verbatimLocality: Tchivinguiro, picada da Banja; Event: year: 1961; month: 12; day: 21; Record Level: collectionID: urn:lsid:biocol.org:col:15867; institutionCode: K; source: http://specimens.kew.org/herbarium/K001057489   Type status: Isotype. Occurrence: recordedBy: G. Barbosa; F.Moreno 9730; Location: country: Angola; stateProvince: Huila; verbatimLocality: Tchivinguiro, picada da Banja; Event: year: 1961; month: 12; day: 21; Record Level: collectionID: urn:lsid:biocol.org:col:14498; institutionCode: COI   Type status: Isotype. Occurrence: recordedBy: G. Barbosa; F.Moreno 9730; Location: country: Angola; stateProvince: Huila; verbatimLocality: Tchivinguiro, picada da Banja; Event: year: 1961; month: 12; day: 21; Record Level: collectionID: urn:lsid:biocol.org:col:15078; institutionCode: LISC   Type status: Other material. Occurrence: recordedBy: R. Deschamps; F. Murta; M. Da Silva 1183; Location: country: Angola; stateProvince: Huila; verbatimLocality: Serra do Bruco, pres de Sá da Bandeira; verbatimElevation: 1610 m; verbatimLatitude: 15°09'S; verbatimLongitude: 13°16'E; Event: year: 1972; month: 2; day: 21; Record Level: collectionID: urn:lsid:biocol.org:col:15078; institutionCode: LISC GoogleMaps   Type status: Other material. Occurrence: recordedBy: Centro de Botânica da Junta de Investigações do Ultramar, ex Herbário Missão de Huilla 313; Location: country: Angola; stateProvince: Huila; verbatimLocality: Without locality; Record Level: collectionID: urn:lsid:biocol.org:col:15078; institutionCode: LISC   Type status: Other material. Occurrence: recordedBy: H. H. Johnston s.n.; Location: country: Angola; verbatimLocality: Without Locality; Event: year: 1883; month: 9; Record Level: institutionCode: K; collectionCode: urn:lsid:biocol.org:col:15867; source: http://specimens.kew.org/herbarium/K000938398  

Description

Perennial subshrub 1.2-2 m tall. Stems quadrangular, pubescent, more densely so at nodes with eglandular, spreading or retrorse hairs and reddish sessile glands; inflorescence axis also with shorter glandular hairs; young shoots tomentose. Leaves petiolate; blades paler beneath, ovate, 50-120 mm long; 25-40 mm broad, shallowly serrate, base rounded to cuneate, sometimes asymmetric, pubescent with red sessile glands, grey tomentose beneath when young; petioles 8-15 mm long. Inflorescence terminal, branched at base, lax; verticils 2-6-flowered, 5-10 mm apart; bracts inconspicuous, soon deciduous; pedicels 4-5 mm long, spreading, forming a right angle with the calyx. Calyx deflexed, 4 mm long at anthesis, pubescent with reddish sessile glands; fruiting calyx 7 mm long; posterior lip erect; lateral lobes of anterior lip deltoid with posterior margin extended towards posterior lip; median lobes of anterior lip lanceolate, subulate at apex; longer than the lateral lobes. Corolla usually deflexed, pinkish, 10 mm long; tube 7 mm long, straight, dilating slightly towards throat; anterior lip cucullate enclosing stamens. Stamens 4, declinate, enclosed within the anterior lip; posterior pair inappendiculate, glabrous, adnate to the corolla above the midpoint of the tube; anterior pair glabrous, adnating nearer throat, anthers dorsifixed, synthecous. Disk 4-lobed, with anterior lobe larger. Ovary glabrous, deeply 4-lobed; style gynobasic, capitate, branches rounded, equal, adpressed. Nutlets brown, obovate with a small basal scar, minutely tuberculed, producing a small amount of mucilage when wet. Fig. 1.

Diagnosis

Differs from all other African species of Orthosiphon   except Orthosiphon thymiflorus   (Roth) Sleesen in being a shrub rather than a suffrutex sprouting annual stems, or an annual herb. Differs from Orthosiphon thymiflorus   in being larger and more erect, 1.2-2 m tall, rather than straggling to 0.2-1.2 m tall; and with longer larger discolorous leaves, 50-120 mm long, and greyish tomentose beneath, rather than 10-40 mm long and sparsely pubescent. The flowers of Orthosiphon cinereus   are also more strongly deflexed.

Etymology

Named after the grey tomentose indumentum of the stems and abaxial leaf surfaces.

Distribution

Endemic to Angola.

Ecology

Damp area in forest; 1610-1700 m, alt.

Conservation

No recent gatherings of this species have been collected and the specimens mostly lack precise localities. This species is best viewed as data deficient.

Taxon discussion

This is a distinctive, easily recognized species, differing from the most large-leaved specimens of Orthosiphon thymiflorus   which lack the discolous, greyish leaf indumentum and have spreading rather than deflexed flowers. Orthosiphon thymiflorus   is found throughout tropical Africa and the large leaf size seen in specimens similar to the type of Orthosiphon longipes   Baker represent an extreme of the variation Fig. 2. Orthosiphon longipes   was placed in synonymy of Orthosiphon thymiflorus   in Paton et al. (2013). The shrubby habit is seen in Asia and Madagascar Orthosiphon   , Orthosiphon aristatus   (Blume) Miq. and Orthosiphon adenocaulis   A.J.Paton & Hedge being respective examples and in Orthosiphon americanus   Harley & A.J.Paton from Colombia, the only New World member of the genus. However, the species in Africa are mainly suffrutices with annual stems being produced from woody rootstocks. The little habitat information available from the specimens of Orthosiphon cinereus   suggests that the species occupies a wetter forest than the seasonally dry forest habitat of Orthosiphon thymiflorus   and other Angolan species.