Poa compressa L., Sp. Pl. 69. 1753.

Ortega-Olivencia, Ana & Devesa, Juan A., 2018, Updated checklist of Poa in the Iberian Peninsula and Balearic Islands, PhytoKeys 103, pp. 27-60 : 27

7. Poa compressa L., Sp. Pl. 69. 1753.

Poa planiculmis Weber, Suppl. Fl. Holsat. 3. 1787. [Type: "Habitat in collibus prope Neumuhlen"].

Poa compressa var. depauperata Mutel, Fl. Franç. 4: 81. 1837. [Type: "plante étiolée, forêts des Alpes et du Jura"].

Poa compressa var. langeana (Rchb.) W.D.J. Koch, Syn. Fl. Germ. Helv. ed. 2: 932. 1844.

Paneion compressum (L.) Lunell, Amer. Midl. Naturalist 4: 222. 1915.

Poa cenisia subsp. sardoa E. Schmid, Vierteljahrsschr. Naturf. Ges. Zürich 78: 239. 1933. [Type: "Perdas Crapias am Gennargentu, 1820 m, Gneissfelsflur (22.VII.1923, b.) ..."].

Poa compressa Ill. Portal (2005: 95, 276), Soreng and Peterson (2012: 11, fig. I, F-M).

Type.

" Habitat in Europae & Americae septentrionalis siccis, muris, tedis" (lectotype designated by Soreng 2000, pg. 255: LINN-87.41!) .

Flowering.

May to September (October).

Ecology.

Meadows and grasslands, forests, gravelly areas, margins of roads and slopes; edaphically indifferent, although preferring basic substrates; (75) 540-1990 (2300) m a.s.l.

Distribution.

Circumboreal (most of Europe, to SW Asia); introduced in N, C and S America (Peru, Argentina) and Australia. CN and E Spain, rarer in the south. And. Port.: TM. Spa.: A (Ab) B (Bi) Bu (Cs) Cu Ge Gr Gu H Hu J L (Le) Lo (Lu) M Na (Or) P S Sa Sg So T Te (V) Va Vi (Z) Za. For a representative list of studied materials, see Suppl. material 1.

Notes.

Plants of this species usually have a glaucous green colour. The lower (and sometimes higher) leaves of many studied herbarium specimens are missing their blades and are frequently fragmented with the ligule exposed. Inflorescences of P. compressa are frequently narrow and interrupted, with almost adpressed branches and spikelets are variable in size and number of flowers. The spikelets may be long, almost always entirely glabrous and glaucous, with 4-9 flowers or short and bear 2-5 flowers, and this variability may be present in the same population or even on the same plant. Poa compressa has not been previously listed in the flora of Portugal.