Pollen morphology and chromosome numbers of the family Plantaginaceae in North America

Bassett, I. J.; Crompton, C. W.

doi:10.1139/b68-056

Cited by 29 publications

(15 citation statements)

References 7 publications

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“…The chromosome number 2n : 12 has been reported for plants of narrow-leaved plantain from widely different locations in Canada (Bassett and Crompton 1968 Hawaii it is the dominant weed in dry zone pastures at 1000-1200 m (Holmet al 1977). …”

Section: Namementioning

confidence: 99%

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THE BIOLOGY OF CANADIAN WEEDS.: 47. Plantago lanceolata L.

Cavers¹,

Bassett²,

Crompton³

1980

Can. J. Plant Sci.

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116

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Section: Namementioning

confidence: 99%

“…(b\ Substratum -P. lanceolata occurs on a wide range of soil types (Sagar and Harper 1964) but is most common on neutral to basic soils (Bassett and Crompton 1968). Zeiner ( 1946) claimed that it was intolerant of acid soils (pH 4.4-4.5) in a study of plant communities after disturbance in Indiana.…”

Section: Namementioning

confidence: 99%

THE BIOLOGY OF CANADIAN WEEDS.: 47. Plantago lanceolata L.

Cavers¹,

Bassett²,

Crompton³

1980

Can. J. Plant Sci.

Self Cite

116

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“…Acronyms are from Holmgren et al (1981). Pollen grains were acetolized and mounted in silicone oil according to methods outlined in Erdtman (1966) and Bassett & Crompton (1968). Measurements were based on at least 20 grains per specimen.…”

Section: Methodsmentioning

confidence: 99%

Pollen morphology in Loteae (Leguminosae) with particular reference to the genusLotusL.

Crompton¹,

Grant²

1993

Grana

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Pollen morphology was used to clarify some taxonomic differences in the classification of the Loteae tribe and the genus Lotiis. The analysis of palynological data by numerical techniques indicated a clear taxonomic separation of many higher categories. Subgenera Symiatiitrii, Sinipeferia and Acrriispon were determined to be most closely related, while subgenus Horackia is separate. Old World Lotits was found to be stenopalynous while New World Loiru was eurypalynous, thereby separating the species into two phytogeographical regions. Various taxonomic treatments were examined and Old World Lotus appeared to be more clearly defined than the relationships between the North American taxa. This is supported by the results of the palynological study. Some taxa considered.as Lottts sensu strict0 may require classification into other genera. The results indicated affinities within or between taxa the subgeneric and specific level which should aid in selecting possible taxa combinations for purposes of plant breeding and molecular studies. The Loteae is an important tribe in the Leguminosae because many taxa are agriculturally desirable and ecologically significant particularly in the genera Lotus, Tetragonolobrrs and Dorycnium (Duke 1981). Some taxa are hay; pasture and cover plants and supply excellent forage or browse (Grant & Marten 1985). Many species of this tribe do not cause bloat in cattle (Jones & Lyttleton 1971). Allen & Allen (1981) reported that 55 species of Lotus, 5 species of Tetrngortolobris and 5 species of Dorycrzirrrn showed root nodulations indicative of nitrogen fixing ability through association with the bacteria genus Rhizobiwn.In the absence of a monographic treatment of Lotits which included the North American taxa, it seemed advisable to study the taxonomy-palynology of the Loteae. We therefore, investigated the palynology of those taxa which have been shown by different authors to be related at ?ither the generic or specific level to the tribes Loteae or Zoronilleae. All Lotics and Loteae taxonomies are contro-(ersial because of attempts to include or exclude taxa indig-:nous to North America, or Africa (Greene 1890, Brand 1898. Modern authors (Polhill 1981, Isley 1981 have ended to ignore this problem. It can be observed in Table I hat not only are tribal differences inconsistent, but many jiverse generic interpretations of taxa also exist. In spite of hese differences, the taxonomy at the species level is relaively consistent [e.g. see treatment of Greene (1890), Otley (1923Otley ( , 1934, Wiggins (1980) and Isley (1981)l. Practia1 considerations may well be the cause of a lack of taxoiomic agreement at the generic level. Several reasons may be advanced for this problem: 1) taxonomic tradition, e.g. adherence to names complying with the "Code of Botanical Nomenclature"; 2) the reliance of taxonomists on the Engler & Prantl System (Taubert 1893); 3) the occurrence of endemic Loteae-like taxa at several "centers of origin" or "centers of diversity" has caused researchers to create many categ...

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“…lanceolata by LM and TEM which she described as a sort of pore formed by the interruption of the ectexine, within which is an operculum whose structure is exactly the same as that of the interpolar ectexine. Bassett & Crompton (1968) described a total of 31 species in North America on the basis of LM investigations; six of these species occur in the Iberian Peninsula. A direct relation between the diameter of the pollen grain and the ploidy level was reported.…”

Section: Previous Work On Palynologymentioning

confidence: 99%

“…major, again finding a relationship between the diameter and polyploidy. This author did not use the t e r m "reticulate" t o describe t h e ornamentation of t h e exine as Bassett & Crompton (1968) did. Clarke & Jones (1980) studied Plantaginaceae from NorthWestern Europe by LM a n d SEM and proposed a key for t h e seven pollen types.…”

Section: Previous Work On Palynologymentioning

confidence: 99%