Poa pratensis subsp. irrigata (Lindm.) H. Lindb. Sched. Pl. Finland. Exs. 2: 20. 1916.

Soreng, Robert J., Sylvester, Steven P., Sylvester, Mitsy D. P. V. & Clark, Vincent Ralph, 2020, New records and key to Poa (Pooideae, Poaceae) from the Flora of Southern Africa region and notes on taxa including a diclinous breeding system in Poa binata, PhytoKeys 165, pp. 27-50 : 27

Poa pratensis subsp. irrigata (Lindm.) H. Lindb. Sched. Pl. Finland. Exs. 2: 20. 1916. Fig. 6

≡ Poa irrigata fo. ehrhartii Lindm., Bot. Not. 1905: 89, 1905. Poa humilis Ehrh. ex Hoffm., Deutschl. Fl. 1: 45. 1800.

≡ Poa pratensis var. humilis (Ehrh. ex Hoffm.) Spenn, Fl. Friburg. 1: 130. 1825.

= Poa subcaerulea Sm., Engl. Bot. 14: t. 1004. 1802. Poa pratensis subsp. subcaerulea (Sm.) Hiitonen, Suom. Kasvio 205, f. 5. 1933 (based on Poa subcaerulea ). Type: UK. Anglesea, on the mountains of Westmoreland and Cumberland, [June 1801], Rev. H. Davies s.n. [EBot. 1004] [E: B: A. 1004] (lectotype, designated by R.J. Soreng and Mark A. Spencer in Sylvester et al. 2020: BM (BM001168037 [image!] ex Sowerby’s Herbarium; isolectotypes: K (K000641177 [image!], LINN (LINN-HS127-53 [image!])).

Type.

Sweden. Upsaliae, Ehrhart 115 (lectotype, designated by Sylvester et al. 2020: LINN (LINN-HS127-54 [image!]); isolectotypes: LE (LE00009654 [image!], LE00009655 [image!], LE00009656 [image!], LE00009657 [image!], LE00009658 [image!] plant B on sheet), LE-TRIN-2598.02 [not seen], O! [plant B on E. Fries, Hb. Norm. 9: 93a, from “Upsaliae”], UPS [not seen], W (W0029751 [image!])).

Economics.

possibly frequent but rarely collected, often seeded for lawns and soil stabilisation.

Vouchers.

South Africa. Eastern Cape: between Casrlisleshoekspruit Pass and Tiffindell Ski Area, S30.677202 E27.956643, 2526 m alt., basaltic substrate, Afro-montane riparian wetland, 10 Feb 2020, S.P. Sylvester et al. 3437 (NU, PRE, US); Eastern Cape: Tiffindell Ski Area, S30.674511 E27.959358, 2521 m alt., basaltic substrate, heavily grazed livestock paddocks amongst alpine grassland, 12 Feb 2020, S.P. Sylvester et al. 3471 (NU, PRE, US).

Notes.

Sometimes passing under other names: Poa humilis Ehrh. ex Hoffm., P. subcaerulea Sm. This subspecies is highly favoured for growing dense soft, dark green, durable, lawn turf. 2 n = 54, 56, 65, 84, 98, 105, 112, 119, 140, 82-147.

Figures

Figure 6. Poa pratensis subsp. irrigata. A whole plant B junction of sheath and blade of tiller leaf showing collar with ciliolate margin C part of inflorescence with spikelets in lateral view. Images of S. P. Sylvester et al. 3437 (US).