Fig. 418. Seed of White Water Lily, enclosed in its aril.
384. A short and thickish appendage at or close to the hilum in certain seeds is called a Caruncle or Strophiole (Fig. [419]).
Fig. 419. Seed of Ricinus or Castor oil plant, with caruncle.
385. The various terms which define the position or direction of the ovule (erect, ascending, etc.) apply equally to the seed: so also the terms anatropous, orthotropous, campylotropous, etc., as already defined ([320], [321]), and such terms as
Hilum, or Scar left where the seed-stalk or funiculus falls away, or where the seed was attached directly to the placenta when there is no seed-stalk.
Rhaphe, the line or ridge which runs from the hilum to the chalaza in anatropous and amphitropous seeds.
Chalaza, the place where the seed-coats and the kernel or nucleus are organically connected,—at the hilum in orthotropous and campylotropous seeds, at the extremity of the rhaphe or tip of the seed in other kinds.
Micropyle, answering to the Foramen or orifice of the ovule. Compare the accompanying figures and those of the ovules, Fig. [341]-[355].