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BIOSYSTEMATICS OF THE BOTHRIOCHLOA BARBINODIS COMPLEX (GRAMINEAE)
Author(s) -
Wet J. M. J.
Publication year - 1968
Publication title -
american journal of botany
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.218
H-Index - 151
eISSN - 1537-2197
pISSN - 0002-9122
DOI - 10.1002/j.1537-2197.1968.tb07492.x
Subject(s) - biology , inflorescence , botany , poaceae , new variety , cultivar
The New World species of Bothriochloa O. Kuntze are polyploids with 2 n = 60, 120, 180 and 220 chromosomes and they reproduce sexually. Plants with 2 n = 180 chromosomes constitute the extremely variable B. barbinodis (Lag.) Herter, which is subdivided into var. barbinodis , var. palmeri (Hack.) de Wet comb. nov., and var. schlumbergeri (Fourn.) de Wet comb. nov. The single collection with 2 n = 220 chromosomes belongs with var. schlumbergeri . Plants resembling B. barbinodis in inflorescence structure but having well‐developed pedicellate spikelets and 2 n = 120 chromosomes are included in B. campii (Swallen) de Wet comb. nov. South American collections of B. springfieldii (Gould) Parodi differ from North American collections in having 2 n = 60 rather than 120 chromosomes and in having larger inflorescences as does B. barbinodis . Variety australis de Wet. var. nov. is described to include them.