Abstract
Most (94 %) of the known eucalypts have been examined for the presence of oil glands in vegetative tissues other than the mesophyll and the primary cortex of the stem. In certain species oil glands occur in the pith and, in a few cases, in the midrib as well. In others (series Corymbosae) oil ducts occur in the pith and in the midrib. In others again (Macrantherae Normales) glands are formed in the phloem of both root and shoot. As a general rule, species which have glands or ducts in the pith do not have glands in the phloem, and vice versa. The only exceptions are provided by nine species of the "eudesmioid complex" (defined below). Of eucalypt species, 58 % have no glands in either the pith or the phloem. It is believed that glands never develop in the primary cortex of the root but always in that of the shoot. The occurrence of glands in the pith or the phloem is constant in many species but others show great variability in the numbers of glands present. Possible explanations for the observed variability are suggested and further lines of investigation are indicated. The age of the tree at which glands first appear in the bark varies widely from one species to another and less widely within species; glands appear precociously in root bark. The age of the secondary phloem itself at which it produces glands also shows wide variations between species. In the Corymbosae the full development of the oil duct system is closely correlated with the ontogenetic juvenile-adult foliage change. The taxonomic implications of the presence or absence of glands in the pith and phloem are discussed. The characters have proved useful for field and herbarium identification. The presence or absence of pith glands is particularly valuable in dealing with Western Australian species.
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Claims 10
Claim · model-written summary
Oil glands occurred in pith and sometimes midrib of certain eucalypts.
- Taxon
- Eucalyptus
.jpg?width=60)
Eucalyptust0 - Organ / stage
- pithe0
- Outcome
- oil glands occure0
Not reportedTreatmentComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“In certain species oil glands occur in the pith and, in a few cases, in the midrib as well”
t0“Eucalyptus”
Claim · model-written summary
Corymbosae had oil ducts in pith and midrib.
- Taxon
- EucalyptusEucalyptust0
- Material
- series Corymbosaee0
- Outcome
- oil ducts occure0
Not reportedTreatmentComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In others (series Corymbosae) oil ducts occur in the pith and in the midrib”
t0“Eucalyptus”
Claim · model-written summary
Macrantherae Normales formed glands in root and shoot phloem.
- Taxon
- EucalyptusEucalyptust0
- Material
- Macrantherae Normalese0
- Outcome
- glands are formede0
Not reportedTreatmentComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In others again (Macrantherae Normales) glands are formed in the phloem of both root and shoot”
t0“Eucalyptus”
Claim · model-written summary
Pith glands or ducts and phloem glands were generally mutually exclusive, except in nine species.
- Taxon
- EucalyptusEucalyptust0
- Outcome
- do not have glands in the phloeme0
- Value
- nine speciese0
Not reportedTreatmentComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“species which have glands or ducts in the pith do not have glands in the phloem, and vice versa. The only exceptions are provided by nine species”
t0“Eucalyptus”
Claim · model-written summary
Fifty-eight percent of eucalypt species lacked pith and phloem glands.
Not reportedTreatmentComparatorDirection
Verbatim
e0“Of eucalypt species, 58 % have no glands in either the pith or the phloem”
Claim · model-written summary
Glands were believed absent from primary root cortex but present in shoot cortex.
- Taxon
- EucalyptusEucalyptust0
- Outcome
- glands never develop in the primary cortex of the root but always in that of the shoote0
Not reportedTreatmentComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“glands never develop in the primary cortex of the root but always in that of the shoot”
t0“Eucalyptus”
Claim · model-written summary
The age at which bark glands first appear varied widely between species.
- Taxon
- treee0
- Outcome
- age of the tree at which glands first appear in the barke0
- Direction
- varies widelye0
Not reportedTreatmentComparator
Verbatim
e0“The age of the tree at which glands first appear in the bark varies widely from one species to another”
Claim · model-written summary
Glands appeared precociously in root bark.
- Taxon
- EucalyptusEucalyptust0
- Outcome
- glands appear precociously in root barke0
Not reportedTreatmentComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“glands appear precociously in root bark”
t0“Eucalyptus”
Claim · model-written summary
Oil duct development in Corymbosae correlated with juvenile-to-adult foliage change.
- Taxon
- EucalyptusEucalyptust0
- Material
- Corymbosaee0
- Outcome
- full development of the oil duct systeme0
Not reportedTreatmentComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In the Corymbosae the full development of the oil duct system is closely correlated with the ontogenetic juvenile-adult foliage change”
t0“Eucalyptus”
Claim · model-written summary
Pith and phloem gland characters proved useful for field and herbarium identification.
- Taxon
- EucalyptusEucalyptust0
- Outcome
- field and herbarium identificatione0
Not reportedTreatmentComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The characters have proved useful for field and herbarium identification”
t0“Eucalyptus”