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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. [citation needed] It often contains the nectaries of the plant.
calyx. pl. calyces. Collective term for the sepal s of one flower; the outer whorl of a flower, usually green. Compare corolla. calyx tube A tube formed by the fusion of the sepals (calyx), at least at the base. cambium Tissue layer that provides partially undifferentiated cells for plant growth. campanulate Bell-shaped. camptodromous
Clearly attached to the hypanthium are four calyx lobes – which look like tiny leaves beneath the yellow petals – of between 2.2-4mm in length and 1-3mm in width. [1] The calyx lobes are oblong and covered with tiny hairs and are unattached to each other except by the hypanthium. [1]
Epicalyx – a series of bracts below the calyx. Floral axis – Floral envelope – the perianth [16] Flower – Fruit – a structure containing all the seeds produced by a single flower. Hypanthium – Nectar – a fluid produced by nectaries that is high in sugar content; used to attract pollinators.
The hypanthium of the Toyon shrub is also generally obconic in shape. [4] The Asian tree Eriobotrya latifolia and several other species within the genus Eriobotrya have an obconic calyx, although some individuals manifest clavate calices. [5] The basal portion of the pistil of Pachypodium baronii exhibits the obconic structural design.
The calyx, moreover, may or may not be persistent, is rarely acrescent (i.e. continuing in the fruit), imbricate or valvate. The corolla is composed of 5 free petals (commonly less than 5 or absent in Swartzieae, Amorphieae and Caesalpinioideae, or 3 to 4 in Mimosoideae) or partially united and presents, in general, a characteristic morphology.
B Bt C K3:(2) C ↓ C3:2 r ↓ A(3):2 r ↓+4 r:1 0 G 1↓ Vm8–10 [2]: 246 – the formula of Tamarindus indica; bract and petaloid bracteoles; monosymmetric calyx of three and two petaloid sepals; monosymmetric corolla of three and two reduced petals; two whorls of stamens, the outer monosymmetric from three fused and two reduced stamens ...
In the flowers the calyx tube, hypanthium, and pedicel are around 10-20mm long together, the calyx tube is some 2-5mm in diameter, there are 4-5 rounded, small and inconspicuous calyx lobes, rarely greater than 0.5mm in length.