Poa matris-occidentalis matris-occidentalis

Soreng, Robert J. & Peterson, Paul M., 2012, Revision of Poa L. (Poaceae, Pooideae, Poeae, Poinae) in Mexico: new records, re-evaluation of P. ruprechtii, and two new species, P. palmeri and P. wendtii, PhytoKeys 15, pp. 1-104 : 34

publication ID

https://dx.doi.org/10.3897/phytokeys.15.3084

persistent identifier

https://treatment.plazi.org/id/C89E6A69-17D9-54FD-9945-96A916812A91

treatment provided by

PhytoKeys by Pensoft

scientific name

Poa matris-occidentalis matris-occidentalis
status

 

11a. Poa matris-occidentalis matris-occidentalis Figs 10 A-C View Figure 10 11 C-L View Figure 11

Description.

Leaf sheaths smooth, glabrous; collars glabrous; ligules abaxially glabrous. Lemma keel and marginal veins glabrous, between veins muriculate. Lodicules 0.3-0.4 mm long, broadly lanceolate, with a lateral lobe.

Distribution.

This subspecies is known only from Cerro Gordo, Durango.

Ecology.

Known only from a single locality at Cerro Gordo, between 3130-3200 m where the species was found growing on steep, rocky, and grassy slopes beneath open forests of Pseudotsuga menziesii (Mirb.) Franco, Quercus spp., Pinus spp., with other associates, such as: Arctostaphylos pungens Kunth, Bromus carinatus Hook. & Arn., Bromus richardsonii Link, Muhlenbergia cenchroides (Humb. & Bonpl. ex Willd.) P.M. Peterson, Trisetum viride (Kunth) Kunth, Festuca sp., Carex sp., and Agrostis sp. Flowering September and October.

Specimens examined.

Mexico. Durango: Transect from Paseo de Cerro Gordo to the top (cumbre), 23°12'31.1"N, 104°56'53.0"W, 3136-3348 m, 9 Sep 2006, P.M.Peterson 20011 & F. Sánchez-Alvarado (CIIDIR, US).

Discussion.

Cerro Gordo is quite remote from other high peaks in the area as it takes nearly 10 hours of driving from Durango along a dirt road to reach the base of the mountain, just south of Maiz Gordo. There are other mountains in Durango that approach this height and it would seem reasonable to assume that this species might occur on these.

Kingdom

Plantae

Phylum

Tracheophyta

Class

Liliopsida

Order

Poales

Family

Poaceae

Genus

Poa