Taxonomic revision and nomenclatural update of Paspalum sect. Pectinata (Poaceae, Panicoideae, Paspaleae)

Abstract

A taxonomic revision and nomenclatural update for Paspalum sect. Pectinata is presented. This section comprises seven species distributed from southern Mexico to Peru, Bolivia and southern Brazil, and is characterized by having linear to lanceolate blades, inflorescences subdigitate or conjugate with a winged rachis, and upper glume and lower lemma 3–7-nerved. We include 16 names and propose lectotypes for Paspalum aspidiotes, P. contractum, P. cordatum, P. lanciflorum and P. pectinatum. Also, after examination of herbarium specimens, a new synonym for Paspalum reticulinerve is proposed. The revision was based on a review of the relevant literature, study of types and materials from 43 herbaria. Descriptions, distribution maps, illustrations and comments are presented for each species, and a key to all species is included.

Taxonomic Revision of Paspalum Group Caespitosa (Poaceae, Panicoideae, Paspaleae)

“…Morphologically, Paspalum is characterized by having unilateral racemose inflorescences, plane-convex, solitary or paired spikelets, lower glume frequently absent, upper glume and lower lemma papyraceous to membranous, lower palea and lower flower usually absent, and upper anthecium indurated (Zuloaga & Morrone, 2005; Delfini et al, 2017).…”

Paspalum (Poaceae) das formações savânicas e campestres do Parque Ecológico Bernardo Sayão, Distrito Federal, Brasil

“…Paspalum imbricatum é relacionada a P. pectinatum e P. cordatum pela gluma superior alada (Denham et al 2002;Delfini et al 2017). Se diferencia de P. cordatum por apresentar lema inferior glabro, enquanto em P. cordatum o lema inferior tem tricomas nas margens.…”

“…Paspalum pectinatum está relacionada a P. imbricatum e P. cordatum pela gluma superior alada. Paspalum pectinatum e P. imbricatum diferenciam-se pela sinflorescência com dois a três ramos subconjugados e lema inferior ciliado com tricomas de base tuberculada em P. pectinatum e sinflorescência com 4-5 ramos alternos e lema glabro em P. imbricatum (Denham et al 2002;Delfini et al 2017).…”

“…Diferencia-se de P. cordatum (Delfini et al 2017) pelo número de ramos por sinforescência (2-3 ramos em P. pectinatum e 5-10 ramos em P. cordatum) e pelo comprimento dos tricomas no lema inferior (excedem as margens da gluma superior em P. pectinatum e não as excedem em P. cordatum).…”

Phylogenetic Relationships in the Group Caespitosa of Paspalum L. (Poaceae, Panicoideae, Paspaleae)

“…Rchb., and Harpostachys (Trin.) S. Denham) and 27 sections have been recognized [6][7][8][9][10][11][12][13][14][15][16][17][18][19][20]. In addition to these, about 30 groups without a formal taxonomic level were proposed within subgenus Paspalum, mainly based on morphological characters of inflorescences and spikelets, due to the difficulty of establishing clear limits between sections [8,9].…”