Impatiens nilalohitae Hareesh & M.Sabu, 2017
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publication ID |
https://doi.org/ 10.11646/phytotaxa.323.2.7 |
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persistent identifier |
https://treatment.plazi.org/id/D11887EC-331D-F342-B9B1-FF7BBD96FA3B |
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treatment provided by |
Felipe |
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scientific name |
Impatiens nilalohitae Hareesh & M.Sabu |
| status |
sp. nov. |
Impatiens nilalohitae Hareesh & M.Sabu View in CoL sp. nov. ( Figures 1 View FIGURE 1 & 2 View FIGURE 2 )
Impatiens nilalohitae is phenotypically similar to I. adamowskiana but differs by having a non-winged stem, setaceous stipular gland, 10– 15-flowered inflorescence, dark purple flower, four lateral sepals, and spur with a notched apex. It is also similar to I. rugosipetala but differs by having 10–15-flowered inflorescence, dark purple flower with non-rugose petals, four lateral sepals, lower sepal with an acute apex, and a spur with a notched apex.
Type: — INDIA. Arunachal Pradesh: Lower Dibang Valley district, in between Tiwari Gaon and Mayodia ± 2100 m. a.s.l., N 28° 15.225’, E 95° 52.706’, 6 May 2016, V. S. Hareesh 143753 (holotype CALI!, isotype CAL!).
Non-succulent herbs to 1 m long; stem subterete or quadrangular, not winged, glabrous, green; internodes 3–8 cm long, green, glabrous; nodes swollen when mature; stipular glands setaceous, glabrous, dark pink. Leaves alternate or spirally arranged proximally and crowded at apex, subsessile or petiolate; lamina 12–20 × 4.5–8.5 cm, ovate-elliptic, caudate-acuminate at apex, cuneate at base, coriaceous, dark green above and purple beneath, glabrous on both sides; lamina margin crenate or serrate, serrations apiculate; lateral nerves 13–16 on each side of midvein, prominent; petiole 2–3 cm long, glabrous, pale green; stipular gland small, setaceous, pink. Inflorescence an axillary raceme, 10–15- flowered; bract 8–9 × 3–3.5 mm, subovate, acuminate at apex, glabrous; pedicel 10–12 mm long, glabrous, green; lateral sepal 4, outer sepals 2, 5–6 × 2–2.5 mm, ovate, apex subacute, glabrous, dark violet or deep pink; inner sepals 2, 1.5–2 × 0.5–0.8 mm, linear with broadened base, acuminate at apex, glabrous, dark violet; dorsal petal 5–7 × 5–6.5 mm, broadly ovate, slightly keeled dorsally, glabrous, dark violet; lateral united petals 12–15 × 4–6 mm, 2-lobed, dark purple with yellow throat; basal lobe 4.5–5 × 5–6 mm, broadly ovate, shallowly clawed, dark purple; distal lobe 8–10 × 0.75–1.25 mm, lorate, twisted, rounded or obtuse at apex, violet; dorsal auricle inconspicuous; lower sepal 10–13 × 6– 7 mm, navicular, apex acute, glabrous, dark pink; spur 10–15 cm long, cylindrical, deeply outwardly curved, glabrous, yellowish green with notched apex. Column ca. 5 × 3.5 mm, straight; filaments ca. 3 × 1.5 mm, glabrous, pale yellow with pale pink streaks at junction of anther lobes; anthers 1.75–2 × 3–3.5 mm, glabrous, yellow. Pistil 3–3.5 × ca. 1 mm; ovary ellipsoid, glabrous. Capsule 1.75–2 × 0.5 cm, linear, glabrous, green; seeds 2 × 1 mm, obovate, cream.
Flowering and Fruiting —April to August.
Etymology —The specific epithet refers to the purple colour (nilalohita in Sanskrit) of the flower and the abaxial leaf blade surface.
Distribution and conservation status — Impatiens nilalohitae is known only from the Lower Dibang Valley district of Arunachal Pradesh, northeastern India. The specimens were collected from moist areas between the way from Tiwari Gaon and Mayodia at elevations from 2000 to 2100 m a.s.l. The taxon grows in association with, e.g., Arisaema concinnum Schott (1859: 27) and Impatiens arguta J.D. Hooker & Thomson (1860: 37) . Presently the new species appears to not be threatened. We observed more than 100 individuals during field trips in 2016 and 2017 but there may be a chance for population decrease by road broadening and other development. From the available data, the conservation status is assessed as Data Deficient (DD).
Additional specimen examined (Paratype) — INDIA. Arunachal Pradesh: Lower Dibang Valley district, between Tiwari Gaon and Mayodia, ± 2100 m a.s.l., 18 May 2017, M. Sabu & V.S. Hareesh 149392 (CALI).
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