Poa imbecilla Spreng.
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Poa imbecilla Spreng. in Biehler, Pl. Nov. Herb. Spreng. 9, no. 14 (1807)
Poa imbecilla Spreng.
Nomenclature
Spreng.
Spreng.
1807
9, no. 14
ICN
Poa imbecilla Spreng.
species
Poa imbecilla
Classification
Subordinates
Vernacular names
Synonyms
Descriptions
Poa imbecilla Spreng.
2n = 28
2n = 28
Poa imbecilla Spreng.
Very fine-leaved, light green perennial, forming small, lax tufts 10-50 cm tall, with conspicuous light-coloured sheaths, and slender, erect culms much exceeding drooping leaves, topped by extremely delicate, green panicles; shortly rhizomatous, new shoots extravaginal; laminae persistent. Sheaths light green, later creamy-brown sometimes purplish, membranous, nerved, smooth; ligule 0.2-0.4-(1) mm long, entire, ± curved across smooth top, slightly scabrous abaxially; lamina (2)- 5-12-(16) cm × 0.5-1 mm, folded, usually filiform, soft, culm leaves 1-3 mm wide, flat, minutely scabrous adaxially just above ligule and on margins, and abaxially on midrib towards long, fine, acute, triangular tip. Culms (4)-10-32-(50) cm tall, smooth, with swollen nodes, rarely scabrous below panicle. Panicle (3.5)-8-15-(25) cm long, lax and delicate; rachis smooth to finely scabrous above, elongate branchlets and pedicels filiform, finely scabrous, spreading, with few spikelets. Spikelets 3-4 mm long, 3-4-(5)-flowered, light green, often purplish. Glumes ± unequal, obtuse, margins finely scabrous, midnerve often with a few prickle-teeth; lower glume 0.8-1.5 mm long, 1-nerved, linear-lanceolate, upper 1.3-1.8 mm long, 3-nerved, ovatelanceolate. Lemma (1.6)-1.8-2.2 mm long, 5- nerved, inner lateral nerves often rather faint, glabrous, margin and nerves near obtuse tip minutely scabrous, elsewhere smooth. Palea 1.2-2 mm long, obviously ciliate on keels, slightly fine-scabrous between keels and often on margins. Lodicules c. 0.2 mm long. Callus glabrous, very rarely with a few fine hairs. Rachilla 0.5-1 mm long, glabrous. Anthers 0.2-0.4 mm long. Caryopsis c. 1 × 0.3 mm, tightly enclosed by lemma and palea. 2n = 28, listed by Hair (1968) as "P. sp." Endemic
Poa imbecilla Spreng.
Very fine-leaved, light green, shortly rhizomatous, small, lax, perennial tufts 10-50 cm, with conspicuous light-coloured leaf-sheaths, and slender, erect culms » drooping leaves, topped by extremely delicate, green panicles; branching extravaginal; leaf-blades persistent. Leaf-sheath light green, later creamy brown sometimes purplish, membranous, ribbed, glabrous. Ligule 0.2-0.4-(1) mm, apically glabrous, entire, ± rounded, abaxially slightly scabrid. Leaf-blade (2)-5-12-(16) cm × 0.5-1 mm, folded, usually filiform, soft, culm-leaves 1-3 mm wide, flat, minutely scabrid abaxially on midrib towards long, fine, acute, triangular tip, and adaxially just above ligule and on margins. Culm (4)-10-32-(50) cm, nodes swollen, internodes smooth, rarely scabrid below panicle. Panicle (3.5)-8-15-(25) cm, lax and delicate; rachis smooth to finely scabrid above, elongate branches and pedicels filiform, finely scabrid, spreading, with few spikelets. Spikelets 3-4 mm, 3-4-(5)-flowered, light green, often purplish. Glumes ± unequal, obtuse, midnerve often with a few prickle-teeth; lower 0.8-1.5 mm, 1-nerved, linear-lanceolate, upper 1.3-1.8 mm, 3-nerved, ovate-lanceolate; margins finely scabrid. Lemma (1.6)-1.8-2.2 mm, 5-nerved but inner lateral nerves often rather faint, glabrous, margin and nerves near obtuse tip minutely scabrid. Palea 1.2-2 mm, keels obviously ciliate, interkeel and often margins sparsely prickle-toothed. Callus glabrous, very rarely with a few fine hairs. Rachilla 0.5-1 mm, glabrous. Lodicules c. 0.2 mm. Anthers 0.2-0.4 mm. Gynoecium: ovary 0.3 mm; stigma-styles 0.5-0.9 mm. Caryopsis c. 1 × 0.3 mm, tightly enclosed by lemma and palea. 2n= 28. Plate 7A.
Taxonomic concepts
Eragrostis imbecilla (Spreng.) Benth.
Poa imbecilla Spreng.
Poa imbecilla Spreng.
Poa imbecilla Spreng.
Poa imbecilla Spreng.
Poa imbecilla Spreng.
Poa imbecilla Spreng.
Poa imbecilla Spreng.
Poa imbecilla Spreng. var. imbecilla
Poa imbecilla Spreng.
Poa matthewsii var. minor Petrie
Poa imbecilla Spreng.
Collections
Notes
editorial
Published the same year in Sprengel, K. P. J.; Mantissa Prima Florae Halensis (Fl. Hal. Mant.) 1: 33. 1807 [Oct.] as "Solander apud. Forst. 499, p. 89 (1786). The text of the second part of Fl. Hal. Mant. (p. 27-58) contains Plantarun Novarum ex Herbario Sprengelii Centarium which was published earlier separately as a dissertation by J.F.T. Biehler.
see Garnock-Jones, P. J., 1986: South Pacific plants named by K. P. J. Sprengel in 1807, Novon 35(1): 123-171.
Metadata
e4b9303f-8136-4b26-8df6-254eb62cc986
scientific name
Names_Plants
1 January 2000
24 April 2006