Paraphlomis strictiflora J.C. Yuan, B. Chen & C.L. Xiang, 2022

Yuan, Jing-Chen, Chen, Ya-Ping, Zhao, Yue, Li, Hai-Bo, Chen, Bin & Xiang, Chun-Lei, 2022, Paraphlomis strictiflora (Lamioideae, Lamiaceae), a new species from Guizhou, China, Phytotaxa 575 (3), pp. 276-286 : 278-280

Paraphlomis strictiflora J.C. Yuan, B. Chen & C.L. Xiang , sp. nov. ( Figs. 1 , 2 )

Type:— CHINA. Guizhou Province, Yinjiang County, Yangjiaping , in the forest or at streamside. 27°51′19.97″N, 108°31′55.90″E, alt. 871m, 21 Jul. 2022, Y. Zhao et al. XCL2120 (holotype: KUN!; isotypes: CSH!, K!, KUN!, PE!) .

Diagnosis:— Paraphlomis strictifora is morphologically most similar to P. lanceolata Handel-Mazzetti (1936: 922) , but differs in its 9–12 mm long (vs. 5–7 mm) and conspicuously (vs. inconspicuously) 5-veined calyces with triangular (vs. broadly ovate-triangular) teeth, and white (vs. yellow to yellowish white) corollas with straight (vs. obviously reflexed) lower lips.

Description:— Perennial herbs, stoloniferous. Stems erect, 50–70 cm tall, rarely branched, 4-angled, sulcate, base glabrous, apex retrorsely strigose, leafless toward the base. Leaves opposite; lamina ovate-lanceolate to lanceolate, herbaceous, 7–16 cm long, 2–5 cm wide, apex long acuminate, base cuneate-decurrent, margin coarsely dentateserrate, adaxially dark-green, sparsely hirsute, abaxially whitish green, sparsely hirsute on veins, lateral veins 3–5 paired; petioles 0.5–1.2 cm long. Verticillasters 2–6-flowered, widely spaced, bracteoles subulate, 1–2 mm long, sparsely strigose, pedicels ca. 2 mm long. Calyx green, obconical, 9–12 mm long, 3–4 mm in diam at apex, sparsely hispidulous on veins outside, glabrous inside, conspicuously 5-veined; teeth 5, subequal, triangular, 2–3 mm long, 2–3 mm wide, apex acute, margin hispidulous. Corolla white, 16–18 mm long; tube 8–10 mm long, ca. 1.5 mm wide, straight, pubescent annulate inside at 1/4 towards base; 2-lipped, lips subparallel, upper lip oblong, entire, erect, ca. 7 mm long, ca. 5 mm wide, densely pubescent outside, lower lip spreading and straight, ca. 8 mm long, 3-lobed, medium lobe largest, trapeziform, ca. 4 mm long, ca. 2 mm wide, margin entire, lateral lobes reflexed. Stamens 4, straight, anterior 2 longer, filament sparsely pubescent, posterior 2 shorter, filament densely pubescent, anther cells 2. Style glabrous, ca. 1.8 cm, long apex subequally 2-cleft, lobes subulate. Ovary glabrous, truncate at apex. Mericarps not seen.

Phenology:— Flowering from July to August.

Etymology:— The specific epithet traces back to the distinct corolla of the new species compared with that of other species of Paraphlomis , with both lips of the corolla straight and not reflexed.

Distribution and habitat:— Paraphlomis strictiflora is currently only known from Fanjing Mountain National Natural Reserve in Guizhou Province, China ( Fig. 3 ). Affected by the Southeast Asia Pacific monsoon, the Fanjing Mountains are located in the subtropical humid monsoon climate zone ( Tsai et al. 2018). The new species grows on moist rocks at the streamside in evergreen broad-leaved forests at an altitude of ca. 900 m.

Common name (assigned here):— zhi hua jia cao su (ĦAE假ďḟ; Chinese name). The name means a species of Paraphlomis with straight corolla in English.

Additional specimens examined (paratypes):— CHINA. Guizhou Province: Yinjiang County , Chanxi Town , 27°51’19.54″N, 108°31’55.2″E, alt. 857 m, 22 Jul. 2021, B. Chen et al. CB05956 (CSH) .

Specimens of P. lanceolata examined: — CHINA. Hunan Province: Wugang City, Yunshan (Mt. Yun), 7 Aug. 1918, H. Handel-Mazzetti 2540 (holotype: WU0063810; isotypes: E00284169, IBSC0005125, GH00001399); Yunshan National Forest Park, 25 Jun. 2021, A. Liu & Y.K. Gong WGYS085 (KUN); Ningyuan County, Jiuyi Mountain Conservation Area, 11 Jun. 2020, A. Liu & C. Ding LK0825 (KUN); Guidong County, Oujiang Town, 11 Jul. 2020, C. Z. Huang s.n. (KUN); Yanling County, Jiuqushui, C.C. Liu et al. LXP-13-23944 (SYS00198865). Jiangxi Province: Luxi County, Wugongshan (Mt. Wugong), 26 Jun. 2017, R.L. Liu & Z.B. Tang 170626012 (GNNU0006350); Ji’an City, Jinggangshan (Mt. Jinggang), 19 Jun. 1965, S.S. Lai 4198 (KUN0277270); ibid., 9 Jul. 1965, S.S. Lai et al. 4403 (KUN0277698).

Figures

FIGURE 1. Morphology of Paraphlomis strictiflora from the type locality. A, B. habitat; C. habit; D–F. verticillasters; G. stolon. (A, B, F, G photographed by Yue Zhao; C–E photographed by Bin Chen).

FIGURE 2. Foliar and floral traits of Paraphlomis strictiflora. A. abaxial and adaxial surfaces of leaves; B. dorsal and ventral view of flowers; C. dissected calyx and lateral view of calyces; D. lateral and dorsal view of corollas and dissected corollas; E. style; F. lateral and frontal view of ovaries. (A–F photographed by Yue Zhao).

FIGURE 3. Distribution of Paraphlomis strictiflora (star) and P. lanceolata (solid circle).