Osbeckia saddlepeakensis Prashob, Manudev, Sibichen & Nampy, 2018
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publication ID |
https://doi.org/ 10.11646/phytotaxa.344.2.7 |
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persistent identifier |
https://treatment.plazi.org/id/03FDCF0A-FFCA-E004-FF77-A1CDFEE9FF6C |
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treatment provided by |
Felipe |
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scientific name |
Osbeckia saddlepeakensis Prashob, Manudev, Sibichen & Nampy |
| status |
sp. nov. |
Osbeckia saddlepeakensis Prashob, Manudev, Sibichen & Nampy View in CoL sp. nov. ( Figure 1 View FIGURE 1 )
Osbeckia saddlepeakensis is similar to O. muralis and O. brachystemon , but differs by its small flowers (2–4.5 mm across), triangular bracts, hypanthium with emergences on basal portion and absence of simple hairs, short stalked inter-sepalar emergences, lanceolate and ciliate sepals and oblong to narrowly ovoid anthers with a single apical pore.
Type:— INDIA. North Andaman Islands: Saddle Peak, ca. 690 m elev. 29 September 2010, Santhosh Nampy & K. M. Manudev 3526 (holotype CAL!, isotypes CALI!, DEV!, MH!).
Annual, erect, branched herbs, 1.5–8 cm tall. Stems, petioles, lamina, peduncles and pedicels covered with ascending to patent thin hairs; hairs simple, 1–3 mm long, unbranched. Stems quadrangular, sparsely hairy, laxly villous. Leaves opposite; petioles 1–3 mm long; lamina ovate, 3-nerved, 0.5–1.5 × 0.3–1 cm, obtuse at base, acute at apex, ciliate at margins, both sides densely hairy. Inflorescence a terminal, short clustered panicle, 3–5-flowered, subtended by 1 or 2 pairs of leaves. Flowers bracteate, tetramerous, 2–4.5 mm across; bracts triangular, 0.3–0.8 mm long, ciliate; pedicels 0.3–1.0 mm long; Hypanthium obconic, 1.8–2.5 × 1.5–2.3 mm, sparsely covered with emergences on lower portion, upper portion glabrous; inter-sepalar emergences 0.5–1.0 mm long, short stalked, caducous; stalk 0.2–0.5 mm long, terete, glabrous; head stellate with a few long hairs; other emergences sessile, smaller in size, restricted to lowermost part of hypanthium. Sepals 4, lanceolate, 1.5–2.5 mm long, ciliate at margins, caducous. Petals 4, obovate, 1.5–3.0 × 1–2 mm, ciliate at apex, pink. Stamens 8, isomorphic; filaments 2–2.5 mm long, glabrous, pink; anthers ovate, 1–2 mm long, yellow, acute at apex, not twisted; pore single, oblique on dorsal side, connective with conspicuous collar having two small dorsal lobes or tubercles and two ventral lobes. Ovary 4–locular, 1.8– 1.5 mm long, united with hypanthium for about half its length, anther pockets present, crown absent; style 2–4 mm long, glabrous; stigma capitate. Capsules obconic, 4-ribbed, 1.8–2.5 × 1.5–2.3 mm; seeds many, 0.2–0.5 mm long, minute, curved.
Etymology:—The species is named after the type locality ‘Saddle Peak’, the highest peak in Andaman and Nicobar Islands.
Distribution, habitat and phenology:—Hitherto known only from type locality. It grows as an undergrowth in evergreen forests at an elevation of 650– 700 m. Flowering and fruiting from August to October.
Taxonomic affinities: — Osbeckia saddlepeakensis is one of the smallest members of the genus in India that shows affinities to O. brachystemon and O. muralis . However, the former is geographically isolated, occurring only in Andaman and Nicobar Islands, while the latter two species are found in the mainland (See Figure 2 View FIGURE 2 ). A comparison of the diagnostic morphological characters of the three species is given in Table 1 and Figure 3 View FIGURE 3 .
Conservation status:— Osbeckia saddlepeakensis is known only from the type locality. According to IUCN criteria (2001, 2014), the species falls under the category Data Deficient (DD).
most allied species.
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