Abstract
SUMMARY Hypericum species have translucent oil cavities; many species also have superficially similar black internal structures. Contradictory descriptions of both structures emerged from 19th century studies, which we review here. Our study of Hypericum perforation L. leaves and petals shows typical schizogenous translucent oil cavities that develop with a uniseriate epithelium. Black structures, in contrast, are nodules, each composed of several large cells lacking a central intercellular space and surrounded by a biseriate sheath of flattened cells. Nodule cells accumulate black, granular, but non‐resinous contents. The ‘streaks’ that traverse petals are elongate tubular cavities or nodules, except for some chimerical tubes composed partly of each. Hypericum balearicum L. leaves have bulging, pustular cavities. A large cellular nodule forms first, by non‐synchronous cell divisions within the leaf mesophyll, and is surrounded by a sheath of two to three flattened cell layers. The central cells then separate unevenly to form an irregular cavity into which isolated cells and clusters of cells intrude, some of which continue to divide as other cells degenerate. Little or no oil accumulates in the cavity, and the peripheral lining of cells is very irregular to flattened and empty. Both species studied exhibit secretory structures with previously undescribed anatomical features.
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Claims 9
Claim · model-written summary
H. perforatum leaves and petals have schizogenous translucent oil cavities with a uniseriate epithelium.
Verbatim
e0“Our study of Hypericum perforation L. leaves and petals shows typical schizogenous translucent oil cavities that develop with a uniseriate epithelium”
Claim · model-written summary
H. perforatum black nodules comprise large cells without a central space and with a biseriate sheath.
- Taxon
- H. perforatum L.
_Hypericum_perforatum_flower_and_buttons.jpg?width=60)
Hypericum perforatumt0 - Outcome
- nodules, each composed of several large cells lacking a central intercellular space and surrounded by a biseriate sheath of flattened cellse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
_Hypericum_perforatum_flower_and_buttons.jpg?width=500)
Verbatim
e0“Black structures, in contrast, are nodules, each composed of several large cells lacking a central intercellular space and surrounded by a biseriate sheath of flattened cells”
t0“H. perforatum L.”
Claim · model-written summary
Nodule cells accumulate black granular non-resinous contents.
- Taxon
- H. perforatum L.Hypericum perforatumt0
- Organ / stage
- Nodule cellse0
- Outcome
- black, granular, but non‐resinous contentse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nodule cells accumulate black, granular, but non‐resinous contents”
t0“H. perforatum L.”
Claim · model-written summary
Petal streaks are tubular cavities, nodules, or chimerical tubes.
- Taxon
- H. perforatum L.Hypericum perforatumt0
- Organ / stage
- petalse0
- Outcome
- elongate tubular cavities or nodules, except for some chimerical tubes composed partly of eache0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The ‘streaks’ that traverse petals are elongate tubular cavities or nodules, except for some chimerical tubes composed partly of each”
t0“H. perforatum L.”
Claim · model-written summary
H. balearicum leaves have bulging pustular cavities.
- Taxon
- Hypericum balearicum L.
Hypericum balearicume0 - Organ / stage
- leavese0
- Outcome
- bulging, pustular cavitiese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Hypericum balearicum L. leaves have bulging, pustular cavities”
Claim · model-written summary
In H. balearicum, a large cellular nodule forms first through asynchronous mesophyll divisions and gains a sheath.
- Taxon
- H. balearicum L.Hypericum balearicumt0
- Organ / stage
- leaf mesophylle0
- Outcome
- A large cellular nodule forms firste0
- Qualifier
- non‐synchronous cell divisionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A large cellular nodule forms first, by non‐synchronous cell divisions within the leaf mesophyll, and is surrounded by a sheath of two to three flattened cell layers”
t0“H. balearicum L.”
Claim · model-written summary
Central cells separate unevenly to form an irregular cavity with intruding cells.
- Taxon
- H. balearicum L.Hypericum balearicumt0
- Outcome
- irregular cavity into which isolated cells and clusters of cells intrudee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The central cells then separate unevenly to form an irregular cavity into which isolated cells and clusters of cells intrude, some of which continue to divide as other cells degenerate”
t0“H. balearicum L.”
Claim · model-written summary
Little or no oil accumulates in the H. balearicum cavity.
- Taxon
- H. balearicum L.Hypericum balearicumt0
- Organ / stage
- cavitye0
- Outcome
- Little or no oile0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Little or no oil accumulates in the cavity”
t0“H. balearicum L.”
Claim · model-written summary
The peripheral cavity cell lining is irregular to flattened and empty.
- Taxon
- H. balearicum L.Hypericum balearicumt0
- Outcome
- peripheral lining of cells is very irregular to flattened and emptye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the peripheral lining of cells is very irregular to flattened and empty”
t0“H. balearicum L.”