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Rosaceae generally have five sepals, five petals, and many spirally arranged stamens. The bases of the sepals, petals, and stamens are fused together to form a characteristic cup-like structure called a hypanthium. They can be arranged in spikes, or heads. Solitary flowers are rare.
In other flowers (e.g., Rosaceae, Myrtaceae), a hypanthium includes the bases of sepals, petals, and the attachment points of the stamens. Mechanical cues may be responsible for sepal growth and there is a strong evidence suggesting that microtubules are present and determine the tensile strength and direction of growth at a molecular level. [16]
Rosa rubiginosa sepals, prickles, glandular hairs Ripe fruits (called "hips") It is a dense deciduous shrub 2–3 meters high and across, with the stems bearing numerously hooked prickles . The foliage has a strong apple -like fragrance.
The rims around the outside of the hypanthium contain the calyx lobes or free sepals, petals and either the stamen or multiple stamen that are attached at one or two points. The flowers of the family Rosaceae , or the rose family, always have some type of hypanthium or at least a floral cup from which the sepals, petals and stamens all arise ...
The sepals are very long, longer than the petals, and are constricted in the middle. The fruits of Nootka rose are somewhat bitter but edible. It is reported that bletting will greatly mitigate the bitterness and make the hips much more palatable. Only the rind should be eaten as the seeds are irritating. [10] Nootka rose showing diagnostic sepals
The early-dropping sepals are ovate or sometimes leaf-like, simple or lobed, cupped towards the apex. The five to several or many petals are white-over-pink to red or purple, obovate with a wedge-shaped base and a rounded apex. There are many stamens. The free, hairy style is almost as long as the stamens. In China, the fruits ripen from June ...
Spiraea / s p aɪ ˈ r iː ə /, [1] sometimes spelled spirea in common names, and commonly known as meadowsweets or steeplebushes, is a genus of about 80 to 100 species [2] of shrubs in the family Rosaceae. They are native to the temperate Northern Hemisphere, with the greatest diversity in eastern Asia.
Trimerous flowers have three sepals of variable size, and in male flowers six to many stamens. Tetramerous flowers have four sepals of 5 mm long at most and either four or eight stamens. In female flowers the sepals are united at their base to form a calyx tube, and have one or two styles, that are finely divided like an ostridge feather.