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In angiosperms, a hypanthium or floral cup [1] [2] [3] is a structure where basal portions of the calyx, the corolla, and the stamens form a cup-shaped tube. It is sometimes called a floral tube , a term that is also used for corolla tube and calyx tube .
For roses, the hypanthium is the tissue that composes the edible part of rosehips. Roses and apples are both members of the Rosaceae family; the fact that they have similar fruit morphology is a major consideration in placing them in the same taxonomic family.
Rosaceae (/ r oʊ ˈ z eɪ s iː. iː,-s i. aɪ,-s i. eɪ /), [5] [6] the rose family, is a family of flowering plants that includes 4,828 known species in 91 genera. [ 7 ] [ 8 ] [ 9 ] The name is derived from the type genus Rosa .
Flowers have a hypanthium to around 3mm wide. Densely prickly neck to 2mm wide. Sepals have toothed lateral lobes and are glandless, with the tip generally being about equal to the body, which is also toothed. Flowers typically contain 10 pistils each. Petals measure 10-20mm [3] and are deep pink, [2] [3] pale pink, or rarely white.
Rose hips contain the carotenoids beta-carotene, lutein, zeaxanthin, and lycopene. [ 6 ] [ 7 ] A meta-analysis of human studies examining the potential for rose hip extracts to reduce arthritis pain concluded there was a small effect requiring further analysis of safety and efficacy in clinical trials . [ 8 ]
A rose produces an aggregate of achene fruits that are encompassed within an expanded hypanthium (aka floral tube), which is a structure where basal portions of the calyx, the corolla, and the stamens unite with the receptacle to form a cup-shaped tube.
If the hypanthium is absent, the flower is hypogynous, and the stamens, petals, and sepals are all attached to the receptacle below the gynoecium. Hypogynous flowers are often referred to as having a superior ovary. This is the typical arrangement in most flowers. If the hypanthium is present up to the base of the style(s), the flower is ...
The hypanthium is 0.8 to 3.2 mm large, and strongly 10-ribbed. [4] ... Chamise is a member of the Rose family (Rosaceae), within the genus Adenostoma.