Weeding the nettles I: Clarifying species limits in perennial, rhizomatous Urtica (Urticaceae) from southern and central Chile and Argentina.
Weigend, Maximilian
Luebert, Federico
Phytotaxa
2009
2009-12-31
2
1
12
5LPXQ
1435599
Linnaeus (1753: 984) subsp. dioica
Linnaeus
1753
[183,830,227,256]
Magnoliopsida
Urticaceae
Urtica
Plantae
Rosales
6
7
Tracheophyta
subSpecies
dioica
dioica
Lectotype(designated by Woodland, 1982: 283): anon., Herb. Linnaeus 1111.8(LINN!, photographs: AUB, DAO, MTMG). — Fig. 1 A. Urtica dioicasubsp. dioicais a widespread nitrophilous weed, common throughout Europe, western Asia, northern Africa and eastern North America. It is also found on several islands in the North Atlantic (e.g., Iceland). The typical subspecies is here reported for the first time from South America, probably from introduced populations. It can be readily differentiated from the native species by its very dense pubescence of stinging hairs on the abaxial leaf veins, its usually much wider and more triangular leaves (in the weedy form foundin South America) and its predominantly dioecious populations. Numerous monoecious individuals of U. dioicasubsp. dioicahave been reported, but these always make up only individual clones in a population, with the bulk of individuals unisexual (Heemskerk et al.1998). So far, monoecious individuals have not been reported from South America. Urtica dioicasubsp. dioicais likely much more common in southern South America than is reflected by the number of specimens studied, as botanists may refrain from collecting it, recognizing it as an introduced weed. It is likely to be locally common in pastures and on road sides in southern and central Chileand Argentina.
Representative specimens: ARGENTINA: Prov. Córdoba, Depto. Río Segundo, Río Segundo, en “Las Compuertas”, 13.11.1970, R. Subilis1084(sterile, MO). CHILE: VIII Región, Bío-Bío: Prov. Concepción, Río Bío-Bíoestuary, 30 m, 36º49' S, 73º10' W, 23.08.1968, C. W. O´Briens.n.(male, CONC). IX Región, Araucanía: Prov. Cautín, Villarica, 220 m, Jan 1962, G. MonteroO. 6531(female, CONC). XIV Región, de Los Ríos: Prov. Valdivia, Valdivia, Isla Teja, 70 m, Dec. 1961, H. Gunckel38.813(female, CONC).
1970-11-13
MO
R. Subilis
Argentina
Prov.
Rio Segundo
Rio Segundo
6
7
1
Cordoba
1968-08-23
CONC
C. W. O'Brien
Chile
Region
30
-36.816666
Rio Bio-Bio
1185
-73.166664
Prov. Concepcion
6
7
1
Biobio
1962-01
CONC
IX Region & Montero
Chile
220
Villarica
Prov. Cautin
6
7
1
Araucania
1961-12
CONC
Gunckel
Chile
Region
70
Valdivia
Prov. Valdivia
6
7
1
Los Rios