Sagina hookeri Timaná & Lebouvier & Rouhan 2019, sp. nov.

• Main Authors: Timaná, M. E., Lebouvier, M., Rouhan, G.
• Format: Other/Unknown Material
• Language: unknown
• Published: 2019
• Subjects: Biodiversity; Taxonomy; Plantae; Tracheophyta; Magnoliopsida; Caryophyllales; Caryophyllaceae; Sagina; Sagina hookeri; Austral; Holo; La Falaise; Saint-Paul; Antarc*; Antarctique*; Île Amsterdam
• Online Access: https://zenodo.org/record/5932003; https://doi.org/10.5281/zenodo.5932003

Sagina hookeri Timaná, sp. nov. (Figs 2; 3; 4) Sagina hookeri Timaná, sp. nov. is morphologically close to Sagina diffusa (Hook.f.) Timaná but differs in its caespitose life form, much smaller overall size, and wide obtuse petals. TYPUS. — Terres australes et antarctiques fran ç aises. District de Saint-Paul et Amsterdam, Île Amsterdam, Del Cano, Terres Rouges, 37°52’26”S, 77°32’23”E, alt. 48 m, 16.XII.2016, G. Rouhan, D. Ertz, J. Mieusset, C. Ollive, B. Van de Vijver 1841 (holo-, P[P02434524]!). ADDITIONAL SPECIMENS EXAMINED. — Terres australes et antarctiques fran ç aises. Île Amsterdam, Plaques terreuses sur coulée basaltique près du Camp, 15.XII.1963, A. Lourteig et P. Cour 57, (P [P04937011]!); Haut de la falaise de la Pearl, 13.III.1970, P. Noël s.n. (P [P00915539]!); Cratère Hébert, alt. 180 m, 26.I.1985, J.-C. Jolinon 1060 (P [P04937000]!). PHENOLOGY. — Found flowering and fruiting from December to March (austral summer). DESCRIPTION Caespitose, compact herb; plant upright, 1.2-3.0 cm high (including inflorescence). Leaves opposite, sometimes arching backwards, fleshy, glabrous, sessile, lanceolate, 5.2-8.8 mm long; apex acute, mucronate; midvein barely noticeable; surface smooth, shiny, margin entire. Inflorescences axillary, flowers solitary, pedicel 5.6-9.2 mm long, glabrous, upright even during fruit dehiscence, green to pale green. Flowers tetramerous, rarely pentamerous; sepals 4(5), imbricate, cymbiform, broadly ovate, 1.9-2.8 mm long, 1.1-1.5 mm wide, margins slightly hyaline, apex obtuse, green then turning pale yellow when fruiting, shorter or almost as long as capsule valves, persistently appressed to valves; petals present, 4(5), alternisepalous, thin, white, orbicular, apex wide obtuse to truncate, with a short claw at the base, much shorter than sepals, 1.3- 1.5 mm long, 0.8 mm wide, probably deciduous after anthesis; stamens episepalous, as long as petals. Fruit a 4(5)-valved multiseeded capsule, 2.3-3 mm long, pale yellow at maturity, with valve apices arching backwards when mature; seeds ...