Chromosome numbers, meiotic behavior, and notes on some grasses from Central America and the West Indies

1972 ◽  
Vol 50 (7) ◽  
pp. 1441-1452 ◽  
Author(s):  
Gerrit Davidse ◽  
Richard W. Pohl
Keyword(s):  
Central America ◽  
Chromosome Numbers ◽  
West Indies ◽  
Andropogon Gerardii ◽  
Meiotic Behavior ◽  
Chromosome Counts ◽  
The West

Chromosome numbers and meiotic behavior are reported for 99 collections of grasses representing 47 genera and 88 species. First chromosome counts are reported for the following 20 species: Aristida laxa, n = 22; Chloris ekmanii, n = 20; Chusquea scandens, n = 20; Danthonia domingensis, n = 18; Eragrostis hypnoides, n = 10; E. prolifera, n = 20; Festuca mirabilis, n = 14; Leptochloa scabra, n = 30; Manisuris ramosa, n = 18; Paspalum carinatnm, n = 40; P. distortum, n = 10; Pharus glaber, n = 12; Raddia sympodica, 2n = 22; Raddiella nana, n = 10; Schizachyrium gracile, n = 20; Setaria crus-ardeae, n = 18; Thrasya paspaloides, n = 20; Trachypogon ligularis, n = 10; Trichachne laxa, n = 18; Tristachya avenacea, n = 24. The count for Raddiella nana represents a first generic report. Counts that differ from previous counts for the same taxon are reported for these 11 species: Andropogon gerardii, n = 40; Aristida orizabensis, n = 22; Eragrostis trichocolea, n = 30; Ichnanthus nemoralis, n = 10; Microchloa kunthii, n = 22; Olyra latifolia, n = 22; Panicum cyanescens, n = 27; Paspalum caespitosum, n = 10; P. millegrana, n = 20, 30; Schizachyrium hirtiflorum, n = 20; Trachypogon montufari, n = 30.

The early stages of certain West African Mosquitos

1917 ◽  
Vol 8 (2) ◽  
pp. 135-154 ◽  
Author(s):  
A. Ingram ◽  
J. W. S. Macfie
Keyword(s):  
Central America ◽  
West Indies ◽  
West African ◽  
The West ◽  
Early Stages ◽  
Specific Determination

Howard, Dyar and Knab in their monograph “ The Mosquitoes of North and Central America and the West Indies,” in discussing the rearing of mosquitos, emphasise the importance of larvae in specific determination. They write (Vol. I, p. 181) “ Many species of Culex are of uncertain determination without the associated larvae, while some Aëdes have identical adults, yet dissimilar larvae. The characters of the larvae reside in the modifications of the chitinous appendages of the skin and the arrangement of the hairs. As these are fully retained by the cast skins, it is possible to preserve both the larva and the adult of the same identical specimen, thus assuring absolutely correct associations.”

scholarly journals The genus Triaeris Simon (Araneae, Oonopidae) in Central America and the West Indies

1968 ◽  
Vol 75 (4) ◽  
pp. 351-359 ◽  
Author(s):  
Arthur M Chickering
Keyword(s):  
Central America ◽  
West Indies ◽  
The West

The Mosquitoes of North and Central America and the West Indies

Nature ◽  
1913 ◽  
Vol 91 (2278) ◽  
pp. 420-421 ◽  
Keyword(s):  
Central America ◽  
West Indies ◽  
The West

Chromosome numbers, meiotic behavior, and notes on tropical American grasses (Gramineae)

1974 ◽  
Vol 52 (2) ◽  
pp. 317-328 ◽  
Author(s):  
Gerrit Davidse ◽  
Richard W. Pohl
Keyword(s):  
Chromosome Numbers ◽  
Meiotic Behavior ◽  
Chromosome Counts

Chromosome numbers and meiotic behavior are reported for 126 collections of grasses representing 50 genera and 111 species. First counts are given for the genera Leptothrium, n = 10, and Cryptochloa, 2n = 22 (somatic count). First chromosome counts are given for the following 25 species: Aristida recurvata, n = 11; Axonopus laxus, n = 20; Chloris mollis, n = 20; Chusquea longifolia, n = 20; Cryptochloa concinna, 2n = 22; Digitaria abyssinica, n = 18; Eragrostis airoides, n = 36; E. guianensis, n = 10; Eriochloa boxiana, n = 18; Gymnopogon foliosus, n = 10; Leptothrium rigidum, n = 10; Luziola pittieri, n = 12; L. spruceana, n = 24; Otachyrium inaequale, n = 10; Panicum cayennense, n = 27; P. chloroticiun, n = 18; P. schiffneri, n = 18; Pappophorum pappiferum, n = 30; Paspalum apiculatum, n = 10; P. arundinaceum, n = 30; P. contractum, n = 9; P. coryphaeum, n = 30; P. trachycoleon, n = 20; Setaria barbata, n = 27; and Trisetum foliosum, n = 28. Counts that differ from previously reported counts are given for the following 15 species: Axonopus chrysoblepharis, n = 10; Cenchrus brownii, n = 34; Digitaria horizontalis, n = 9, 27; Echinolaena gracilis, n = 10; Euclasta condylotricha, n = 10; Hyperthelia dissoluta, n = ca. 30; Ischaemum guianense, n = 18; Microchloa indica, n = 12; Paspalum candidum, n = 10; P. melanospermum, n = 20; P. prostratum, n = 10; Rhytachne rottboellioides, n = 16; Setaria paniculifera, n = 16; Sorghastrum incompletum, n = 20; and Thrasya petrosa, n = 30. Changes in nomenclature are indicated for Digitaria species whose chromosome numbers were reported in our earlier publications.

The Biological Control of the Weed Clidemia hirta, D. Don., in Fiji

1933 ◽  
Vol 24 (3) ◽  
pp. 345-348 ◽  
Author(s):  
Hubert W. Simmonds
Keyword(s):  
Biological Control ◽  
Central America ◽  
West Indies ◽  
Natural Order ◽  
The West ◽  
British Guiana ◽  
Rubber Plantations ◽  
Northern Portion ◽  
The Rich ◽  
Almost All

The plant Clidemia hirta belongs to the natural order Melostomaceae. It is of shrubby growth, with a hard tough stem and produces quantities of dark purple berries, filled with minute seeds. These berries are much relished by certain birds, which feed upon them and distribute the seeds. The leaves are covered with fine hairs and the plant is not eaten by stock.The plant is a native of the West Indies, Central America and the Northern portion of South America. It is supposed to have been introduced into Fiji from British Guiana at some time prior to 1890. That this was the origin of the plant is supported by slight differences observed by the writer in the foliage of the Trinidad, Panama and British Guiana forms of the plant, the Fijian one closely resembling those of the last named country.In Fiji the plant was first observed along the fences of paddocks in the Waimanu Valley, whence it spread with great rapidity, quickly becoming a weed of major importance. By 1919, when the writer arrived in the country, thousands of acres were covered with it to the exclusion of almost all other growth. On good soil it formed a stand five or six feet high, through which the cattle were only able to keep open narrow paths. Not only did it rapidly occupy the open grass lands, particularly the rich dairying and fattening country, but it thrived almost equally well under the shade of coconut and rubber plantations, leading to loss of many fallen nuts and entailing greatly increased weeding costs.

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