Text-book of structural and physiological botany . Fig. 333.— Spiny seed oi Stellaria, entire andcut through, both lengthwise and trans-versely, showing the campylotropous form,the curved embryo surrounding a copiousendosperm (magnified). ^ [The term aril is, strictly speaking, confined to a structure of thiskind which springs from the hilum, as in Passiflora^ Taxits, iVynipIhca,&c. A similar structure, origmating at ar near the micropyle, as inEii07iymus^ Eicphorbia^ Folygaia, &c., is a false aril or <2;77/(?c/c ; if fromthe testa, independent of the micropyle or funicle, as in Chdidoniiit
Text-book of structural and physiological botany . Fig. 333.— Spiny seed oi Stellaria, entire andcut through, both lengthwise and trans-versely, showing the campylotropous form,the curved embryo surrounding a copiousendosperm (magnified). ^ [The term aril is, strictly speaking, confined to a structure of thiskind which springs from the hilum, as in Passiflora^ Taxits, iVynipIhca,&c. A similar structure, origmating at ar near the micropyle, as inEii07iymus^ Eicphorbia^ Folygaia, &c., is a false aril or <2;77/(?c/c ; if fromthe testa, independent of the micropyle or funicle, as in Chdidoniiitn\Viola, &c., d<. strophiole ox caruncle.—Ed.] 156 Structural and Physiological Botany. bitter; the inner layer thin and white. The testa is oftenleathery, crustaceous, or even stony [as in the Brazil-nut];and is either smooth (Fig. 331), or with pit-Uke depressions(Fig. 332), or covered with spines (Fig. 333), and may bewhite or coloured. The nucleus of the seed consists essentially, of an embryo.,in addition to which is found
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Keywords: ., bookcentury1800, bookdecade1870, bookpublishernewyorkjwileysons
