An "'ochrea "'( Latin " ocrea ", greave or protective legging ), also spelled "'ocrea "', is a plant structure formed of stipules fused into a sheath surrounding the stem, and is typically found in the Polygonaceae.
2.
An "'ochrea "'( Latin " ocrea ", greave or protective legging ), also spelled "'ocrea "', is a plant structure formed of stipules fused into a sheath surrounding the stem, and is typically found in the Polygonaceae.
3.
While it superficially resemble bindweeds in the genus " Convolvulus " there are many notable differences; it has ocrea ( stipule-sheath at nodes ), which " Convolvulus " does not; and " Convolvulus " has conspicuous trumpet-shaped flowers while Black-bindweed has flowers that are unobtrusive and only about 4 mm long.
4.
Around the stem of both these species there is a papery sheath known as an "'ocrea "'with stiff spine-like hairs at the top, but in " P . caespitosum " these hairs are much longer, as long as the visible portion of the ocrea, whereas in " P . persicaria " they are much shorter.
5.
Around the stem of both these species there is a papery sheath known as an "'ocrea "'with stiff spine-like hairs at the top, but in " P . caespitosum " these hairs are much longer, as long as the visible portion of the ocrea, whereas in " P . persicaria " they are much shorter.
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