ee a 
1904] CHRYSLER—CENTRAL CYLINDER 175 
ASsTELIA sp. (funkia coerulea) offers no points of significance. 
Lilioideae.— LILIUM CANADENSE.—The young plant consists of a 
vertical axis upon which is set a spiral series of fleshy awl-shaped 
scales which are loaded with starch; to each of these three traces run 
from the tubular central cylinder, taking a course directly outward or 
even curving downward for a short distance after leaving the central 
cylinder. These traces, though slender, subtend foliar gaps which 
frequently extend the whole length of an internode, so that the central 
cylinder has the appearance of three separate collateral strands, 
except at the nodes, where a vascular ring is formed, and in the lower 
part of the seedling, where the scales are more crowded. Fig. 23 
shows the appearance of the central cylinder at a node, ¢ is the median 
trace; bordering the vascular strands are cells differing from the 
surrounding parenchyma by their entire lack of starch; these may 
represent a phloeoterma. In the higher regions of the stem the usual 
medullary bundles appear, and some of these are amphivasal. 
ERYTHRONIUM AMERICANUM, CALOCHORTUS VENUSTUS, GALTONIA 
CANDICANS, SCILLA HYACINTHOIDES, CAMASSIA FRASERI, Hyacrn- 
THUS CANDICANS, and LACHENALIA PENDULA early assume the bulbous 
habit characteristic of the adult plant, hence the stem is flattened in 
the vertical direction. The complications produced in the vascular 
tissues by this habit render these genera unprofitable for study, and 
since there is no reason to believe that the bulbous condition is a 
primitive one, no description of these genera will be necessary here. 
Allioideae.—Artium Crpa, A. CANADENSIS, and A. ANGULOSUM 
have seedlings much resembling those of the last group in their 
bulbous habit and intricate vascular system. 
AGAPANTHUS UMBELLATUS has a stele much resembling that of 
lium. 
Asphodeloideae.—AspHopEeLus FISTULOSUS, ASPHODELINE LIBUR- 
NICA, BULBINE ANNUA, B, FRUTESCENS, ANTHERICUM Liz1aco, CHLo- 
ROPHYTUM ELATUM, KNIPHOFIA Tysont, K. BREVIFOLIA, and ALOE 
SP: agree in having short internodes and passing quickly through the 
early stages of stelar development, so that the medullary bundles are 
found near the exit of the cotyledonary traces. Further, an endodermis 
a: rarely discernible, so that these genera are unsuitable in the present 
Investigation. 
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