Post by Melanie on Apr 12, 2011 11:08:26 GMT 1
Dimeria kerrii Teerawat. & Sungkaew, sp. nov. Dimeria kerrii C. E. Hubb., nom. nud. Dimeria kerrii Nanakorn & Norsangsri, 2001, nom. nud. TYPE: Thailand. Satun: Ban Tola Tai [Tola], ca. 50 m, 3 Jan. 1928, A. F. G. Kerr 13868 (holotype, K 648084; isotypes, BM 928281, K 648258). Figure 2.
Haec species ab omnibus congeneris thailandicis glumae superioris carina ala rugosa lata ornata differt.
Perennial. Culms up to 1.2 m tall, erect; nodes pubescent, stems waxy below nodes, usually short-noded at base. Leaf sheaths overlapping below, 6–9 cm, sparsely pilose at lower part, upper part tomentose, margins scarious. Ligules membranous, ciliolate, ca. 0.6 mm. Leaf blades linear-lanceolate, 10–20 × 3–4.5 mm, tomentose on both surfaces, sparsely pilose with tubercle-based hairs especially toward the margins, margins scabrous near the apex. Racemes (2 or)3, 8–16 cm, rhachis flattened, 0.6–0.7 mm wide, slightly zigzag, slightly ridged, ridge glabrous, narrowly winged, margins scaberulous; peduncles distally hirsute. Spikelets ovate-oblong, 5–6 × 1.8–2 mm; pedicels compressed but not flattened, 0.8–1.2 mm, margins glabrous, clavate; spikelet callus hairy, hairs up to 0.5 mm; lower glumes oblong, 5–5.5 mm, acuminate, keeled, ciliate on keel; upper glumes oblong-elliptic, 5.5–6 mm, acute to acuminate, keeled, sparsely hirsute near margins, broadly winged all along the keel, wings rugose and ciliate; lower lemmas oblanceolate or clavate, 2.5–3 mm, margins ciliate on the upper half; upper lemmas oblong-elliptic, ca. 4 mm, awns 12–15 mm, columns 2–3 mm; stamens 2, anthers 1.8–2 mm. Caryopses not seen.
Distribution and habitat. Dimeria kerrii is endemic to Thailand and is known only from the type locality (Satun Province in peninsular Thailand) at an altitude of ca. 50 m.
IUCN Red List category. Using the IUCN Red List criteria (IUCN, 2001), Dimeria kerrii could be considered as either Endangered (EN) or possibly Extinct (EX). Despite attempts by the authors to re-collect it at the type locality, it remains known only from collections last made in 1928, in Satun Province in peninsular Thailand. Because data regarding its conservation are insufficient, we provisionally assign the status as Data Deficient (DD).
Discussion. This species was first named by C. E. Hubbard on the two specimens of the A. F. G. Kerr 13868 collection at Kew, but Hubbard never published its description. The name later appeared in an enumeration of Thai grass species (Nanakorn & Norsangsri, 2001), but a Latin diagnosis was not provided; it is therefore considered invalid in accordance with Art. 36.1 and Rec. 36A of the International Code of Botanical Nomenclature (McNeill et al., 2006).
This species is distinguished from all other species of Dimeria by its rugose, broad wing on the keel of the upper glume.
Etymology. Arundinella kerrii and Dimeria kerrii are named in honor of Arthur Francis George Kerr (1877–1942), the Irish doctor and botanist, who undertook large botanical collections in Thailand. He collected over 25,000 herbarium specimens all over Thailand while working for the Thai government between 1902 and 1932.
www.bioone.org/doi/full/10.3417/2009033?prevSearch=%255Ball%253A%2Bextinct%255D&searchHistoryKey=&queryHash=eaa0376be7725c39cc29dad521eca65c
Haec species ab omnibus congeneris thailandicis glumae superioris carina ala rugosa lata ornata differt.
Perennial. Culms up to 1.2 m tall, erect; nodes pubescent, stems waxy below nodes, usually short-noded at base. Leaf sheaths overlapping below, 6–9 cm, sparsely pilose at lower part, upper part tomentose, margins scarious. Ligules membranous, ciliolate, ca. 0.6 mm. Leaf blades linear-lanceolate, 10–20 × 3–4.5 mm, tomentose on both surfaces, sparsely pilose with tubercle-based hairs especially toward the margins, margins scabrous near the apex. Racemes (2 or)3, 8–16 cm, rhachis flattened, 0.6–0.7 mm wide, slightly zigzag, slightly ridged, ridge glabrous, narrowly winged, margins scaberulous; peduncles distally hirsute. Spikelets ovate-oblong, 5–6 × 1.8–2 mm; pedicels compressed but not flattened, 0.8–1.2 mm, margins glabrous, clavate; spikelet callus hairy, hairs up to 0.5 mm; lower glumes oblong, 5–5.5 mm, acuminate, keeled, ciliate on keel; upper glumes oblong-elliptic, 5.5–6 mm, acute to acuminate, keeled, sparsely hirsute near margins, broadly winged all along the keel, wings rugose and ciliate; lower lemmas oblanceolate or clavate, 2.5–3 mm, margins ciliate on the upper half; upper lemmas oblong-elliptic, ca. 4 mm, awns 12–15 mm, columns 2–3 mm; stamens 2, anthers 1.8–2 mm. Caryopses not seen.
Distribution and habitat. Dimeria kerrii is endemic to Thailand and is known only from the type locality (Satun Province in peninsular Thailand) at an altitude of ca. 50 m.
IUCN Red List category. Using the IUCN Red List criteria (IUCN, 2001), Dimeria kerrii could be considered as either Endangered (EN) or possibly Extinct (EX). Despite attempts by the authors to re-collect it at the type locality, it remains known only from collections last made in 1928, in Satun Province in peninsular Thailand. Because data regarding its conservation are insufficient, we provisionally assign the status as Data Deficient (DD).
Discussion. This species was first named by C. E. Hubbard on the two specimens of the A. F. G. Kerr 13868 collection at Kew, but Hubbard never published its description. The name later appeared in an enumeration of Thai grass species (Nanakorn & Norsangsri, 2001), but a Latin diagnosis was not provided; it is therefore considered invalid in accordance with Art. 36.1 and Rec. 36A of the International Code of Botanical Nomenclature (McNeill et al., 2006).
This species is distinguished from all other species of Dimeria by its rugose, broad wing on the keel of the upper glume.
Etymology. Arundinella kerrii and Dimeria kerrii are named in honor of Arthur Francis George Kerr (1877–1942), the Irish doctor and botanist, who undertook large botanical collections in Thailand. He collected over 25,000 herbarium specimens all over Thailand while working for the Thai government between 1902 and 1932.
www.bioone.org/doi/full/10.3417/2009033?prevSearch=%255Ball%253A%2Bextinct%255D&searchHistoryKey=&queryHash=eaa0376be7725c39cc29dad521eca65c
