Gomphostemma hemsleyanum Prain ex Collett

Bongcheewin, Bhanubong, Ingrouille, Martin J. & Paton, Alan J., 2022, A revision of Gomphostemma (Lamiaceae), Kew Bulletin 77 (1), pp. 27-92 : 72-73

23. Gomphostemma hemsleyanum Prain ex Collett & Hemsl.

( Hemsley 1890: 116); Prain (1891: 230); Mukercee (1920: 205). Type: Burma, Meiktila [20.8665°, 93.8665°], Sept. 1888, Collett 885 (CAL [CAL0000020312] photo, lectotype selected here; isolectotype K [K000826320]). (Another syntype, Collet 15, has not been seen.)

Herb up to 0.6 m tall. Stems erect, obtusely quadrangular with longitudinal grooves, with dense stellate hairs and sometimes dendroid hairs. Leaoes subsessile, chartaceous; blades elliptic or elliptic-ovate, 2 – 13 × 1 – 5 cm, apex acute, margin deeply crenate or serrate, base attenuate; upper side dark green with bifurcate hairs, 1 – 2 (– 3)-celled simple hairs and sometimes stellate hairs; lower side pale green with dense stellate hairs; petiole 0 – 10 mm long. Inflorescence axillary with opposite cymes sessile, congested with axis not visible between flowers, inserted at the upper nodes at which leaves are usually present; verticils fewflowered; bracts elliptic or elliptic-obovate, 10 – 13 × 3 – 6 mm, upper side with simple hairs, lower side with dense stellate hairs; bracteoles narrowly ovate, 3 – 8 × 0.3 – 1 mm. Flowering calyx infundibular, 8 – 12 mm long, 10-ridged, outside with dense stellate hairs, inside with adpressed simple hairs; tube 3 mm long; lobes triangular, 3 – 5 mm long, apex acute. Fruiting calyx ovate-infundibular, 11 – 18 mm long, outside with dense stellate hairs, inside with adpressed simple hairs; tube 3 – 5 mm long; lobes triangular, 6 – 11 mm long, 3 – 2 mm wide at base, apex acute. Corolla 10 – 13 mm long, throat narrow, gradually dilated towards the throat, outside glabrous, inside with an annulus of simple hairs; tube slender, incurved, 3 – 5 mm long, included in calyx. Staminal filaments fleshy. Style slightly fleshy, linear with apex unequally lobed. Nutlets 2, ellipticoblong or elliptic, 3 – 2 × 2 – 3 mm long, wrinkled.

DISTRIBUTION. Burma. Map 5 .

SPECIMENS EXAMINED. MYANMAR. Meiktila, Sept. 1888, Collett 885 (lectotype CAL photo; isolectotype K).

HABITAT. In mountain areas.

CONSERVATION STATUS. Known only from the type collection made in September 1888. Hence, the?ata?eficient (??) category is applied to this species.

PHENOLOGY. Flowering and fruiting September.

NOTES. Gomphostemma hemsleyanum is recognised by having an axillary inflorescence, no soft hairs on leaves and is found in North Burma

Keng (1969) recognised a specimen, 3acker 8221 (BO), from East Java as Gomphostemma hemsleyanum probably by comparing the specimen with an illustration [Ann. Roy. 3ot. Gard. (Calcutta) 3 (1891), plate 82] from Prain’ s revision (1891). Unfortunately, this collection has not been examined.

The epithet hemsleyanum is dedicated to Mr W. B. Hemsley who assisted Prain preparing a revision of Gomphostemma ( Prain 1891) .

Figures

Map 5. Distribution range of Gocphostecca leptodon, G. castersii, G. celissifoliuc and G. ovatuc.