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Chalaza

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chalaza [kə′lāz·ə]
(botany)
The region at the base of the nucellus of an ovule; gives rise to the integuments.
(cell and molecular biology)
One of the paired, spiral, albuminous bands in a bird's egg that attach the yolk to the shell lining membrane at the ends of the egg.
Chalaza 

the basal part of the ovule where the seed stalk attaches the ovule to the placenta.
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The hilum is broad and relatively large (unlike those of Sesbania, Tephrosia and Rhynchosia), located at or near the centre of the seed (unlike many wild Vigna species), and situated very dose to the chalaza (Figure 5).
Early domesticated cowpea (Vigna unguiculata) from Central Ghana by D'Andrea, A.C.; Kahlheber, S.; Logan, A.L.; Watson, D.J. / Antiquity
In terms of angiosperm morphology, the chalaza is recognized as the region where the integument and nucellus are fused together.
Seed coat anatomy of Ceratozamia mexicana (Cycadales) by Sanchez-Tinoco, Maria Ydelia; Engleman, E. Mark / The Botanical Review
Confusion between chalaza and nucellus originates from the general practise of referring to the (proximal) part of the nucellus nearest the chalaza as the "chalazal region of the nucellus," or "chalazal nucellus.
The nucellus and chalaza in monocotyledons: structure and schematics by Rudall, Paula J. / The Botanical Review
 
 
 
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