Primulina hochiensis (C.C.Huang & X.X.Chen) Mich. Moeller & A.Weber var. ochroleuca, F.Wen Y.Z.Ge & Z.B.Xin 2020

Ge, Yu-Zhen, Xin, Zi-Bing, Fu, Long-Fei, Chou, Wei-Chuen, Huang, Yi, Huang, Zhang-Jie, Maciejewski, Stephen & Wen, Fang, 2020, Primulina hochiensis var. ochroleuca (Gesneriaceae), a new variety from a limestone area of Guangxi, China, and errata on five new species of Primulina, PhytoKeys 152, pp. 111-120 : 111

publication ID	https://dx.doi.org/10.3897/phytokeys.152.50968
persistent identifier	https://treatment.plazi.org/id/C79BD987-1A98-5A2D-908E-EE29A537415E
treatment provided by	PhytoKeys by Pensoft
scientific name	Primulina hochiensis (C.C.Huang & X.X.Chen) Mich. Moeller & A.Weber var. ochroleuca, F.Wen Y.Z.Ge & Z.B.Xin
status	var. nov.

Treatment

Primulina hochiensis (C.C.Huang & X.X.Chen) Mich. Moeller & A.Weber var. ochroleuca, F.Wen Y.Z.Ge & Z.B.Xin View in CoL var. nov. Figs 1 View Figure 1 , 2A View Figure 2

Diagnosis.

The new variety can be easily distinguished from all varieties of Primulina hochiensis by its pale yellow corolla. It differs from the typical variety, P. hochiensis var. hochiensis by its stolon lacking and obviously longer petiole (5-7 cm long); from P. hochiensis var. ovata by its stolon lacking, obviously longer petiole (5-7 cm long) and longer pedicel (1.5-2 cm long); from P. hochiensis var. rosulata by its longer pedicel (1.5-2 cm long), shorter calyx (3.5-4 mm long), corolla throat with one big yellow patch and longer pistil (1.4-1.8 cm long).

Type.

China. Guangxi Zhuang Autonomous Region, Guilin City, Gongcheng County, Xiling Town, 24°55'N, 110°45'E, altitude ca. 220 m, 8 October 2019, Fang Wen et al., WF191008-03 (Holotype: IBK!; Isotypes: IBK!).

Description.

Herbs perennial, acaulescent. Leaves basal, 20-35; petiole cylindrical, densely extremely short pubescent, 5-7 × 0.4-0.5 cm; leaf blade elliptical to slightly ovate, 5.5-7.5 (-9) × 3-5 cm, densely appressed puberulent, base cuneate, margin entire, apex acute; lateral veins 4-6 on each side of the midrib, conspicuous on the abaxial surface, inconspicuous on the adaxial surface. Cymes 4-6, axillary, 1-3-branched, 2-8-flowered; peduncle 5-10 cm long, 1-1.5 mm in diameter, densely erect puberulent; bracts 2, opposite, linear, 3-3.5 × 1 mm, puberulent. Pedicel 1.5-2 cm long, 1-1.5 mm in diameter, puberulent. Calyx 5-parted from the base; segments equal, lanceolate-linear, 3.5-4 × 1-1.2 mm, densely pubescent, margin entire, apex acute. Corolla pale yellow, throat with two distinctly elliptic yellow spots, 2.5-3 cm long, orifice 0.6-0.8 cm in diameter, outside puberulent with both glandular and eglandular hairs, inside glabrous; tube narrowly infundibuliform, 1-1.2 cm long; limb distinctly 2-lipped, adaxial lip 2-parted to the base, lobes slightly oblique linguiform or ovate, ca. 5 × 2.5 mm; abaxial lip 3-parted to the middle, lobes obliquely ovate, ca. 8 × 4 mm. Stamens 2, adnate to ca 1.0 cm above the corolla base; anthers purple, reniform, ca. 1.5 × 1.2 mm, slightly constricted at the middle; filaments geniculate close to the base, ca. 6 mm long, glabrous; staminodes 3, lateral ones short linear, glabrous, 1-1.2 mm long, adnate to 4-5 mm above the corolla base, the central one linear, 0.8-1 mm long, adnate to 2.5-3 mm above the corolla base. Disc annular, margin entire or sometimes slightly erose, ca. 0.7 mm high. Pistil 1.4-1.8 cm long; ovary linear, 3-4 mm long, 1-1.5 mm in diameter, densely puberulent with both glandular and eglandular hairs; style 1.1-1.4 cm long, ca. 0.5 mm in diameter, glandular-puberulent. Stigmas translucent to white, obtrapeziform, apex 2-parted up to the middle, 0.8-1 mm long. Capsule linear, 1.8-2 cm long, ca. 1.5 mm in diameter, puberulent with both glandular and eglandular hairs.

Phenology.

Flowering occurs from September to November, and fruiting from November to January of the next year.

Etymology.

The specific epithet ' ochroleuca ' is derived from its pale yellow corolla. The original epithet ' ochro - leuca ' derived from the Greek, ‘ώχρα,’ namely ' ochra -,' means ochre, yellowish and ‘λευκά,’ namely '- lefka ' means white.

Vernacular name.

Huáng Huā Hé Chí Bào Chūn Jù Tái (Chinese pronunciation); 黄花河池报春苣苔 (Chinese name).

Distribution and habitat.

Primulina hochiensis var. ochroleuca is hitherto only known from the type locality, Xiling Town, Gongcheng County, Guangxi Zhuang Autonomous Region, South China (Fig. 3 View Figure 3 ), and grows on moist and shaded rocky surfaces on the cliff in subtropical evergreen seasonal rain forest.

Preliminary Conservation status.

The type population consists of approx. 3000 mature individuals, all growing on moist and shaded rocky surfaces on the cliff. They are easily disturbed by human activities because the distance from the type locality to the local village is short. Parts of vegetation of the type hill have been cleared by local people for fruit trees cultivation. Thus, following the IUCN Red List Categories and Criteria ( IUCN 2019), it is temporarily assessed as vulnerable [VU C1].

Additional specimens examined.

Primulina hochiensis (C.C. Huang & X.X. Chen) Mich. Möller & A. Weber var. hochiensis , China: Guangxi, Hechi City, 23 October 1991, C.C. Huang 19670 (Holotype: GXMI!); Huanjiang County, Shuiyuan Town to Xianan Town, limestone hill, 24°49'34.25"N, 108°01'59.01"E, 249 m, 19 Jul. 2013, 451226130719009LY (GXMG!; IBK!). Primulina hochiensis (C.C. Huang & X.X. Chen) Mich. Möller & A. Weber var. ovata L.H. Yang, H.H. Kong & M. Kang, China: Guangxi, Guilin City, Pingle County, Pingle Town, Mawei Village, grows on moist limestone rocks at a lower elevation (150-300 m), 18 June 2016, L.H. Yang PLMW (holotype: IBSC!); Pingle County, Ertang Town, Da’e’shan Village, 18 June 2016, L.H. Yang PLET (IBSC!); Pingle County, Shazi Town, Bao’an Village, 20 June 2016, L.H. Yang PLSZ (IBSC!); Pingle County, Pingle Town, Taiping Village, 6 July 2016, L.H. Yang and M. Kang PLMW (IBSC!); Gongcheng County, Xiling Town, Huzimiao Village, 19 June 2016, L.H. Yang GCXL01 (IBSC!); Gongcheng County, Xiling Town, Panyan Village, 19 June 2016, L.H. Yang GCXL02 (IBSC!). Primulina hochiensis (C.C. Huang & X.X. Chen) Mich. Möller & A. Weber var. rosulata F. Wen & Y.G. Wei, China: Guangxi, Guilin City, Pingle County, Tong’an Town, growing in the entrance of a limestone cave, 24°34'47"N, 110°55'34"E, elevation ca. 149 m, 17 August 2008 (fl.), B. Gao 08171 (holotype IBK!; isotype BJFC!); Gongcheng County, Lianhua Town, on moist limestone rock faces in evergreen broadleaved forest and bushes, located in the subtropical monsoon region, 161 m a.s.l., 11 Jul 2012, Hui-Ling Liang, Yan-Cai Shi & De-Xin Kong, 120711 (IBK!).

Notes.

The morphological comparisons between P. hochiensis var. ochroleuca and the most closely related taxa ( P. hochiensis var. hochiensis , P. hochiensis var. ovata and P. hochiensis var. rosulata ) are provided in Table 1 View Table 1 .