Text-book of botany, morphological and physiological . his arrangement either prevails over the whole shoot together with itssecondary shoots, or occurs only at first, and then passes into spiral arrangements,which very commonly lead to the formation of rosettes radiating on all sides, asin Aloe (see Fig. 144, p. 172), Agave, Palms, &c. The arrangement with the angleof divergence V3 is much rarer, but occurs in some species of Aloe, Carex, Pan-danus, &c. Spiral arrangements Vvith a smaller divergence than \ ., also occur N n 54^ PHANEROGAMS. sometimes ; as in IMusa (in 31. rubra the angle
Text-book of botany, morphological and physiological . his arrangement either prevails over the whole shoot together with itssecondary shoots, or occurs only at first, and then passes into spiral arrangements,which very commonly lead to the formation of rosettes radiating on all sides, asin Aloe (see Fig. 144, p. 172), Agave, Palms, &c. The arrangement with the angleof divergence V3 is much rarer, but occurs in some species of Aloe, Carex, Pan-danus, &c. Spiral arrangements Vvith a smaller divergence than \ ., also occur N n 54^ PHANEROGAMS. sometimes ; as in IMusa (in 31. rubra the angle is, according to Braun, V? i^^the foliage-leaves, Vn i^^ the bracts), and Costus (where the angle of the foliage-leaves is from V4 to ^4) &c. The axillary shoots of Monocotyledons mostly beginwith a leaf in close contact with the primary axis and with its back turned towardsit, and usually bicarinate. Of this character must be considered, for instance, theupper pale of the flower of Grasses, which is itself an axillary shoot of the lower. Fig. 392.—Crocus ?vermes: A the bulbous stem seen from above, B seen from below, C from the side and cutthroujjh lengthwise ; fff the circular line of scars of the cataphyllary leaves, k k the corms which t,frow in their axils ;b the base of the decayed flower- and leaf-stem, by its side (lik in Q next years bud, from which a new corm andflower-stem will be produced; D longitudinal section through this bud, n « its cataphyllary leaves, // foliage-leaves,h bract, / perianth, a anthers, k a bud in the axil of a foliage-leaf. pale. When the phyllotaxis of successive orders of shoots is alternate in two rows,the result of this arrangement is that a whole system of shoots is bilateral, or maybe divided by a plane which bisects the leaves (as in Potamogeton, Typha, &c.). The mode of insertion of the cataphyllary and foliage-leaves, and veryoften that of the hypsophyllary leaves (as for instance that of the spathe whichis of common occurrence) is
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectbotany, bookyear1875
