Post by Melanie on Apr 12, 2011 11:06:45 GMT 1
Arundinella kerrii Teerawat. & Sungkaew, sp. nov. Arundinella kerrii Hambananda, nom. inval. TYPE: Thailand. Nakhon Phanom: Tha Uthen, ca. 200 m, 16 Feb. 1924, A. F. G. Kerr 8474 (holotype, BK; isotypes, BM, K). Figure 1.
Haec species Arundinellae hirtae (Thunb.) Tanaka et A. fluviatili Hand.-Mazz. similis, sed ab eis foliorum basalium vaginis fibrosis, glumis et lemmatibus superioribus minoribus atque calli flosculi superioris trichomatibus brevioribus ca. 1/5 lemmatis longitudinem aequantibus differt.
Perennial, loosely tufted. Culms 30–120 cm tall, erect, hollow; nodes hirsute, basal sheaths becoming fibrous. Leaf sheaths 9–16 cm, glabrate, margins hispid with tubercle-based hairs. Ligules membranous, ciliolate, 0.5–0.6 mm, with a dense row of hairs behind ligule. Leaf blades narrowly linear, (8–)20–50(−70) × 0.3–0.8 cm, glabrous on both surfaces, margins scabrous and hispid with tubercle-based hairs. Panicles contracted, 5–15 cm long; secondary axes racemose, 1.5–5 cm, alternate, rhachis scabrous. Spikelets grayish green, ovate-oblong, 3–3.6 × 1–1.5 mm; pedicels 0.2–2 mm, scabrous and hispid; lower glumes ovate, 2.5–3 × 0.8–1.2 mm, acute, 3- to 5-nerved, hispid with tubercle-based hairs on nerves; upper glumes ovate to ovate-oblong, 2.5–3.5 × 1–1.2 mm, acuminate, 5-nerved, hispid with tubercle-based hairs on nerves; lower florets male; lower lemmas ovate to ovate-oblong, 2.5–3 mm, acute, upper margins fringed, 5- or 7-nerved; lower paleas ovate-oblong, 2.5–2.7 mm; upper florets hermaphroditic, upper lemmas ovate-oblong, 1.8–2 mm, acute or mucronate or minutely bifid, shortly awned from the sinus, awns 0.5–0.6 mm, 3-nerved; upper paleas ovate-oblong, 1.8–2 mm, acute; callus pubescent, hairs 0.2–0.3 mm; anthers 0.9–1.6 mm. Caryopses not seen.
Distribution and habitat. Endemic to Thailand, this species is known only from Nakhon Phanom Province in northeastern Thailand. Arundinella kerrii occurs in open grasslands at an altitude of ca. 200 m.
IUCN Red List category. Using the IUCN Red List criteria (IUCN, 2001), Arundinella kerrii could be considered as Endangered (EN) or possibly Extinct (EX). The taxon is known only from collections made in Nahkon Phanom Province in northeastern Thailand in 1924, despite attempts by the authors to re-collect it. However, insufficient data exist regarding its conservation status, so we provisionally assign the species status as Data Deficient (DD).
Discussion. Arundinella kerrii is similar to A. hirta (Thunb.) Tanaka and A. fluviatilis Hand.-Mazz., but differs from them in having fibrous basal leaf sheaths, smaller glumes and upper lemma, and shorter callus hairs that are ca. 1/5 the length of the lemma. The differences among A. fluviatilis, A. hirta, and A. kerrii are summarized in Table 1. Arundinella kerrii was originally described, but not effectively published, by Hambananda (1990: 28–30) in an unpublished thesis (McNeill et al., 2006: Art. 30.5). Hambananda's description of A. kerrii was in Thai, but without a Latin diagnosis. In agreement with Art. 36.1 and Rec. 36A of the International Code of Botanical Nomenclature (McNeill et al., 2006), Hambananda's name was neither valid nor effectively published.
Paratype. THAILAND. Nahkon Phanom: Chaiyaburi, ca. 200 m, 1 May 1932, A. F. G. Kerr 21330 (BK, BM, K).
www.bioone.org/doi/full/10.3417/2009033?prevSearch=%255Ball%253A%2Bextinct%255D&searchHistoryKey=&queryHash=eaa0376be7725c39cc29dad521eca65c
Haec species Arundinellae hirtae (Thunb.) Tanaka et A. fluviatili Hand.-Mazz. similis, sed ab eis foliorum basalium vaginis fibrosis, glumis et lemmatibus superioribus minoribus atque calli flosculi superioris trichomatibus brevioribus ca. 1/5 lemmatis longitudinem aequantibus differt.
Perennial, loosely tufted. Culms 30–120 cm tall, erect, hollow; nodes hirsute, basal sheaths becoming fibrous. Leaf sheaths 9–16 cm, glabrate, margins hispid with tubercle-based hairs. Ligules membranous, ciliolate, 0.5–0.6 mm, with a dense row of hairs behind ligule. Leaf blades narrowly linear, (8–)20–50(−70) × 0.3–0.8 cm, glabrous on both surfaces, margins scabrous and hispid with tubercle-based hairs. Panicles contracted, 5–15 cm long; secondary axes racemose, 1.5–5 cm, alternate, rhachis scabrous. Spikelets grayish green, ovate-oblong, 3–3.6 × 1–1.5 mm; pedicels 0.2–2 mm, scabrous and hispid; lower glumes ovate, 2.5–3 × 0.8–1.2 mm, acute, 3- to 5-nerved, hispid with tubercle-based hairs on nerves; upper glumes ovate to ovate-oblong, 2.5–3.5 × 1–1.2 mm, acuminate, 5-nerved, hispid with tubercle-based hairs on nerves; lower florets male; lower lemmas ovate to ovate-oblong, 2.5–3 mm, acute, upper margins fringed, 5- or 7-nerved; lower paleas ovate-oblong, 2.5–2.7 mm; upper florets hermaphroditic, upper lemmas ovate-oblong, 1.8–2 mm, acute or mucronate or minutely bifid, shortly awned from the sinus, awns 0.5–0.6 mm, 3-nerved; upper paleas ovate-oblong, 1.8–2 mm, acute; callus pubescent, hairs 0.2–0.3 mm; anthers 0.9–1.6 mm. Caryopses not seen.
Distribution and habitat. Endemic to Thailand, this species is known only from Nakhon Phanom Province in northeastern Thailand. Arundinella kerrii occurs in open grasslands at an altitude of ca. 200 m.
IUCN Red List category. Using the IUCN Red List criteria (IUCN, 2001), Arundinella kerrii could be considered as Endangered (EN) or possibly Extinct (EX). The taxon is known only from collections made in Nahkon Phanom Province in northeastern Thailand in 1924, despite attempts by the authors to re-collect it. However, insufficient data exist regarding its conservation status, so we provisionally assign the species status as Data Deficient (DD).
Discussion. Arundinella kerrii is similar to A. hirta (Thunb.) Tanaka and A. fluviatilis Hand.-Mazz., but differs from them in having fibrous basal leaf sheaths, smaller glumes and upper lemma, and shorter callus hairs that are ca. 1/5 the length of the lemma. The differences among A. fluviatilis, A. hirta, and A. kerrii are summarized in Table 1. Arundinella kerrii was originally described, but not effectively published, by Hambananda (1990: 28–30) in an unpublished thesis (McNeill et al., 2006: Art. 30.5). Hambananda's description of A. kerrii was in Thai, but without a Latin diagnosis. In agreement with Art. 36.1 and Rec. 36A of the International Code of Botanical Nomenclature (McNeill et al., 2006), Hambananda's name was neither valid nor effectively published.
Paratype. THAILAND. Nahkon Phanom: Chaiyaburi, ca. 200 m, 1 May 1932, A. F. G. Kerr 21330 (BK, BM, K).
www.bioone.org/doi/full/10.3417/2009033?prevSearch=%255Ball%253A%2Bextinct%255D&searchHistoryKey=&queryHash=eaa0376be7725c39cc29dad521eca65c
