Poa pusilla Berggr.
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Details
Poa pusilla Berggr., Minneskr. Kongl. Fysiogr. Sällsk. Lund 8: 31 (1877)
Poa pusilla Berggr.
Nomenclature
Berggr.
Berggr.
1877
31
ICN
Poa pusilla Berggr.
species
Poa pusilla
Classification
Subordinates
Synonyms
Descriptions
Poa pusilla Berggr.
2n = 28
2n = 28
Poa pusilla Berggr.
Slender, often delicate perennial, forming open tufts 5-c. 35 cm tall, with few, very narrow, flaccid, bright green leaves, rhizome slender, long-creeping; new shoots extravaginal; laminae persistent. Sheaths greenish-purple becoming light brown, ± membranous, distinctly keeled with strong whitish lateral nerves, shaggy ciliate-dentate throughout, or minutely scabrous, or ciliate-scabrous only near hyaline margins, occasionally with a few longer hairs on margins near ligule, rarely completely glabrous; ligule 0.2-0.5 mm long, truncate, ciliate across top, sometimes erose, ciliate abaxially; lamina (1)-5-15-(25)cm long, c. 0.5 mm wide when folded, rarely flat, margins inrolled, abaxially distinctly nerved, smooth, but scabrous on midrib near tip, adaxially with scattered short hairs especially along midrib, tip subacute to curved. Culms 3-30- (50) cm tall, very slender, erect or drooping above, smooth. Panicle 1.5-8.5 cm long, with few, filiform, scabrous spreading branchlets bearing 1-4 spikelets at tips. Spikelets 3-7.5 mm long, 2-5-(7)- flowered, yellow-green, faintly purplish. Glumes subequal, 2-4-(4.5) mm long, 3-nerved, narrow elliptic- to ovate-lanceolate, acute or subacute, internerves smooth, midnerve and sometimes lateral nerves sparsely scabrous. Lemma 2-4-(5) mm long, 5-nerved, oblong- to ovate-elliptic, obtuse, midnerve with long silky crimped hairs to ½ length, sometimes scabrous above hairs, lateral nerves usually with conspicuous silky hairs near base or to ½ length, internerves usually smooth, rarely finely scabrous, with hyaline band at slightly erose tip. Palea 2-3.5 mm long, short ciliate-dentate on keels, short ciliate-scabrous between keels, margins smooth to scabrous. Lodicules c. 0.5 mm long. Callus with a thick tuft of long, silky crimped hairs. Rachilla (0.3)-0.6-0.8 mm long, with scattered long hairs. Anthers 1-2 mm long. Caryopsis c. 1 × 0.5 mm. 2n = 28 (and also for plant determined as P. seticulmis). Endemic
Poa pusilla Berggr.
Slender, often delicate, open, perennial tufts, 5-c. 35 cm, with few, very narrow, flaccid, bright green leaves, and slender, long-creeping rhizome; branching extravaginal; leaf-blades persistent. Leaf-sheath greenish purple becoming light brown, ± membranous, distinctly keeled, ribs strong, whitish, shaggy pubescent-scabrid, or minutely scabrid throughout or only near hyaline margins, occasionally with a few longer hairs on margins near ligule, rarely completely glabrous. Ligule 0.2-0.5 mm, truncate, ciliate, sometimes erose, abaxially with minute hairs. Leaf-blade (1)-5-15-(25) cm ×c. 0.5 mm diam., folded, rarely flat and wider, margins inrolled, abaxially distinctly ribbed, glabrous, adaxially with scattered short hairs especially on midrib, tip subacute to curved, scabrid on midrib. Culm 3-30-(50) cm, very slender, erect or drooping above, internodes glabrous. Panicle 1.5-8.5 cm; branches spreading, few, filiform, scabrid, bearing 1-4 spikelets at tips. Spikelets 3-7.5 mm, 2-5-(7)-flowered, yellow-green, faintly purplish. Glumes subequal, 2-4-(4.5) mm, 3-nerved, narrow elliptic- to ovate-lanceolate, acute or subacute, smooth, midnerve and sometimes lateral nerves sparsely scabrid. Lemma 2-4-(5) mm, 5-nerved, oblong- to ovate-elliptic, obtuse, midnerve with long silky crinkled hairs in lower ½, sometimes scabrid above hairs, lateral nerves usually with conspicuous silky hairs near base or in lower ½, internerves usually smooth, rarely finely scabrid, with hyaline band at slightly erose tip. Palea 2-3.5 mm, keels short ciliate-scabrid, interkeel short pubescent-scabrid, flanks smooth to scabrid. Callus with thick tuft of long, silky crinkled hairs. Rachilla (0.3)-0.6-0.8 mm, with scattered long hairs. Lodicules c. 0.5 mm. Anthers 1-2 mm. Caryopsis c. 1 × 0.5 mm. 2n= 28.
Taxonomic concepts
Poa anceps var. gracilis Cheeseman
Poa pusilla Berggr.
Poa anceps var. ζ minima Buchanan
Poa pusilla Berggr.
Poa pusilla Berggr.
Poa pusilla Berggr.
Poa pusilla Berggr.
Poa pusilla Berggr.
Poa pusilla Berggr.
Poa pusilla Berggr.
Poa pusilla Berggr. var. pusilla
Poa pusilla Berggr.
Poa pusilla var. seticulmis (Petrie) Cockayne
Poa pusilla Berggr.
Collections
Metadata
7ce51552-4277-4db8-be57-49dafb2e644d
scientific name
Names_Plants
1 January 2000
7 September 2021