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Taiwan Gramineae | Family List | Poaceae | Poa

Poa annua L., Sp. Pl. 68. 1753; Honda, Monogr. Poac. Jap. 71. 1930; Ohwi, Acta Phytotax. Geobot. 10: 120. 1941; Hitchc., Man. Grass. U.S. 106. f. 119. 1951; Senaratna, Grass. Ceylon 43. 1956; Keng, F. Ill. Pl. Prim. Sinicarum, Gram. 224. f. 179. 1959; Bor, Grass. India 555. 1960.

早熟禾

Poa annua

Credit: CC Hsu, 1975 Taiwan Grasses

plant duration: annuals, biennials

culms :habit: ascending

culms :height (cm): 11-36 cm

culms :diameter (mm): 2 mm

leaf-blades shape: linear

leaf-blades :length (cm): 4-15 cm

leaf-blades :apex: obtuse-acute, acuminate

sheath: not compressed

ligule:texture: membranaceous

ligule :shape: rounded, triangular

ligule :length (mm): 1-2 mm

inflorescence:shape or type: open panicle

inflorescence :length (cm): 2.5-18 cm

spikelets:number of florets: 3-5

spikelets:shape: ellipsoid, oblong, ovoid

spikelets :length (mm): 4 mm

spikelets :width (mm): 1.5-3 mm

pedicel vestiture: glabrous

lower glume shape: lanceolate, ovate

lower glume :length (mm): 1-2 mm

lower glume :number of nerves: 1

upper glume shape: elliptic, ovate

upper glume apex: acute-obtuse

upper glume :length (mm): 1.5-3

upper glume :number of nerves: 3

florets :length (mm): 2.5-3.5 mm

lemma:texture: chartaceous, membranaceous

lemma:shape: ovate-lanceolate, elliptic

lemma:length (mm): 2.5-3.5 mm

lemma :number of nerves: 5

lemma :vestiture on nerves: nerves villous

palea :shape: narrowly lanceolate

palea :apex: blunt, acute

palea :length (mm): 2-3 mm

palea :number of nerves: 2

palea :vestiture on nerves: villous

callus: hairless

anthers:length (mm): 1 mm

caryopsis:shape: ellipsoid

caryopsis :length (mm): 1-1.5 mm

caryopsis :apex: villous

google images search: Link

midrib 中肋: (la)large:several vascular bundles

leaf surface 表面: (fla)flat surface

sclerenchyma 厚壁組織: (boscl)(bostr)on both sides of veins as
strand or girder

chlorenchyma 葉綠組織: (homog)homogenous sponge tissue

bundle sheath 維管束鞘: (nke)bundle sheaths without chloroplast

buliform cells not well developed 泡狀細胞不發達: (irreg)epidermal cells irregular in size

chlorenchyma cell number between two adjacent veins: 7

chloroplast form in bundle sheath 束鞘細胞內之葉綠體型式: (not)no chloroplast

mestome sheath 內束鞘細胞: (Xyms+)metaxylem pole adjacent with
mestome sheath

distance between two adjancent vein 脈間距: 240 micrometer

length/weidth ratio of bundle sheath in LS 束鞘細胞縱面長寬比: 6

chlorenchyma cell shape in LS 葉綠細胞縱面形狀: non -lobed


 

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