scholarly journals Poa secunda J. Presl (Poaceae): a modern summary of infraspecific taxonomy, chromosome numbers, related species and infrageneric placement based on DNA

PhytoKeys ◽  
2018 ◽  
Vol 110 ◽  
pp. 101-121 ◽  
Author(s):  
Robert John Soreng ◽  
Lynn J. Gillespie
Keyword(s):  
North America ◽  
Hybrid Origin ◽  
New Combinations ◽  
Western North America ◽  
Chromosome Counts ◽  
Poa Secunda ◽  
Infraspecific Classification ◽  
Forage Species ◽  
Distinct Morphology ◽  
Infraspecific Taxonomy

Poasecunda J. Presl. s.l. is a morphologically highly variable bunchgrass that is a valuable forage species in western North America. There has been much controversy as to whether multiple taxa should be recognised and at what rank in this taxonomically challenging apomictic complex. Here we propose an infraspecific classification for Poasecunda of six varieties within two subspecies, juncifolia and secunda. New combinations are P.secunda vars. ampla, gracillima, juncifolia, nevadensis and scabrella. Conflicting plastid and nrDNA phylogenies show that P.sect.Secundae is of ancient hybrid origin. Based on this and its distinct morphology, the section is raised to the rank of subgenus. A key is presented for P.secunda infraspecies and closely related non-arctic species. Suppl. materials are provided of chromosome counts for Secundae taxa and D.D. Keck specimen annotations of taxa here included in P.secunda.

The Galium trifidum group (Galium sect. Aparinoides, Rubiaceae)

1976 ◽  
Vol 54 (16) ◽  
pp. 1911-1925 ◽  
Author(s):  
C. Puff
Keyword(s):  
North America ◽  
Eastern North America ◽  
Great Lakes Region ◽  
Western North America ◽  
Eastern Asia ◽  
Chromosome Counts ◽  
New Classification ◽  
North Eastern ◽  
North Western

By using morphology, karyology, pollen size, leaf flavonoids, ecological observations, and modification experiments, a new classification of the Galium trifidum group is proposed. Nine taxa in five species are recognized: (1) G. tinctorium, with ssp. tinctorium and sap. floridanum (new comb.) in eastern North America; (2) G. brevipes, a rare species centered in the Great Lakes region; (3) G. trifidum, with ssp. trifidum in northern North America. Asia, and Europe, ssp. columbianum (new comb.) in (north)western North America and (north)eastern Asia, and ssp. subbiflorum (new comb.) and ssp. halophilum (new comb.) in northern North America; (4) G. innocuum in southeastern Asia; (5) G. karakulense in central Asia.New chromosome counts of n = 12 and 2n = 24 are reported for G. tinctorium ssp. tinctorium and ssp. floridanum; and G. trifidum ssp. trifidum, ssp. columbianum, and ssp. subbiflorum.

Morphological and chromosomal variation in Dodecatheon pulchellum (Primulaceae)

1992 ◽  
Vol 70 (12) ◽  
pp. 2476-2483 ◽  
Author(s):  
Terri A. Suttill ◽  
Geraldine A. Allen
Keyword(s):  
North America ◽  
Morphological Variation ◽  
Genetic Basis ◽  
Common Garden ◽  
Chromosomal Variation ◽  
Western North America ◽  
Chromosome Counts ◽  
Alpine Habitats ◽  
Variable Species ◽  
Ecological Differences

Dodecatheon pulchellum (Raf.) Merr. is a widespread and morphologically variable species of western North America. Analysis of morphological variation, combined with chromosome counts and evidence from a transplant study, showed this species to consist of two subspecies. Subspecies cusickii is pubescent, mainly diploid, and occurs in the drier parts of the species range. The more variable ssp. pulchellum is glabrous to sparsely pubescent, mainly polyploid, and is widely distributed. Within ssp. pulchellum, three varieties can be recognized: the tall, many-flowered var. alaskanum, of wet, low-elevation habitats; the diminutive var. watsonii, generally of alpine habitats; and the intermediate and widely distributed var. pulchellum. Common garden studies indicate that size differences among these varieties have a genetic basis and that ecological differences exist in D. pulchellum even among morphologically similar forms. Key words: Dodecatheon, Primulaceae, systematics, morphology, chromosome numbers, common garden studies.

scholarly journals Xerocomellus (Boletaceae) in western North America

2020 ◽  
Vol 6 (1) ◽  
pp. 265-288
Author(s):  
J.L. Frank ◽  
N. Siegel ◽  
C.F. Schwarz ◽  
B. Araki ◽  
E.C. Vellinga
Keyword(s):  
North America ◽  
Morphological Variability ◽  
Morphological Data ◽  
Eastern North America ◽  
New Combinations ◽  
Western North America ◽  
Key To Species ◽  
Dichotomous Key ◽  
Species Complexes ◽  
Three New Species

Understanding diversity in the genus Xerocomellus in western North America has been obscured by morphological variability, widespread use of species epithets typified by specimens from Europe and eastern North America, misunderstood phylogenetic relationships, and species complexes. We collected extensively and used genetic and morphological data to establish the occurrence of ten Xerocomellus species in western North America. We generated ITS sequences from five type collections and from vouchered representative collections to clarify our understanding of existing species concepts. We describe three new species (Xerocomellus atropurpureus, X. diffractus, and X. salicicola) and propose two new combinations (X. amylosporus and X. mendocinensis), transfer Boletus coccyginus to Hortiboletus, and provide a dichotomous key to species of Xerocomellus in western North America.

Carex lyngbyei excluded from the flora of eastern North America, and taxonomic notes on related species and hybrids

1987 ◽  
Vol 65 (6) ◽  
pp. 1187-1198 ◽  
Author(s):  
Jacques Cayouette
Keyword(s):  
North America ◽  
North Pacific ◽  
Related Species ◽  
Hybrid Origin ◽  
Eastern North America ◽  
Herbarium Specimens ◽  
Western North America ◽  
Pollen Stainability ◽  
The North ◽  
The North Pacific

Carex lyngbyei has been reported from a few stations in eastern North America over the last century. Herbarium specimens so identified from that area are morphologically very diverse and are quite different from the typical C. lyngbyei along the North Pacific coastline and Iceland. This eastern material was found to belong to four species (C. aquatilis, C. crinita var. gynandra, C. paleacea, and C. recta) and six different hybrids (C. ×saxenii, C. ×gardneri, C. ×exsalina, C. ×subnigra, C. ×super-goodenoughii, and C. ×grantii). Pollen stainability of typical C. lyngbyei and of putative C. lyngbyei from eastern North America supported these revisions: it was high in species and low in hybrids or in species of hybrid origin such as C. recta. In western North America, C. lyngbyei has either 2n = 68, 70, or 72 chromosomes and meiosis appears to be regular. In contrast, some putative C. lyngbyei from eastern Quebec showed a highly disturbed meiosis. Consequently C. lyngbyei is excluded from eastern North America.

scholarly journals New relictual genera in Cyrtoquediini and Indoquediini (Coleoptera: Staphylinidae: Staphylininae)

ZooKeys ◽  
2021 ◽  
Vol 1076 ◽  
pp. 109-124
Author(s):  
Adam J. Brunke
Keyword(s):  
North America ◽  
Southeast Asia ◽  
New Combinations ◽  
Western North America ◽  
The World

Sundaquediusgen. nov. (Cyrtoquediini) and Fluviphirusgen. nov. (Indoquediini) are described from southeast Asia and western North America, respectively, resulting in the new combinations Sundaquedius nigropolitus (Cameron) and Fluviphirus elevatus (Hatch). Sundaquedius abbreviatussp. nov. is described from Vietnam. The phylogenetic positions of these genera within Staphylininae are supported by morphology and recently published phylogenomic evidence. New keys to the world genera of Cyrtoquediini and Indoquediini are provided. A new country record for Alesiella lineipennis (Cameron) is provided for Thailand, based on the first available specimen in more than 100 years.

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