45 8 BOTANICAL GAZETTE [j UXE 



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tion of size the cleistogamous stage is reached. But the plants are 

 apt to branch when 15 to 2 o cm high, and bear the larger flowers on 

 the main stem and branches that successively form. Two or three 

 of these stouter stems often spring from the same root, forming a 

 small cluster, with larger and more abundant radical shoots, the 

 plant in all its features showing its greater vigor. In Britton and 

 Brown's Illustrated flora, the statement is made under L. canadensis: 

 "A dwarf form with no corolla is frequent." This evidently refers 

 to the cleistogamous form. But the stage with no corolla is not 

 confined to the dwarf plants. It was not on such that I noticed them 

 at first, but on those which varied in height. In the dune region 

 they may rise to 6 dm and bear the closed flowers in the later stages 

 of growth. As the taller forms often branch quite freely, great 

 numbers of capsules are borne, developing on the principal stem 

 and branches at the same time and long after the ripened capsules 

 lower down have opened and dropped their seeds. Since the branches 

 ascend rather sharply, frequently rising well up to the level of the 

 primary axis, a copiously branched plant, sometimes with fifteen 

 to twenty members, may result. These have a bushy appearance, 

 but they all produce the closed flowers before the plant dies, and 

 manifest its ability to bear vast numbers of seeds. 



The length of the corolla in the closed flowers is 1.2 to i.6 mm . 

 It is tubular, or sometimes slightly funnelform, but owing to the quite 

 rapid growth of the ovary soon becomes enlarged at the base, and 

 when pushed off is shaped more like an inverted funnel; or, if enlarged 

 at the same time above, it has somewhat the form of an hour-glass. 

 The hmb is slightly irregular, the two-lobed upper lip being higher 

 than the three-lobed lower, and overlapping it in the bud. In the 



fig 



a cleistogamous flower, both enlarged five diameters, figs 



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stances. They continue to increase in number on plants of this 

 simple character until the stem ceases to lengthen or becomes j 

 mature, various heights being reached, but rarely more than 2 dm . 

 Other slender and normally simple stems, usually not flowering at 

 all till 12 to.i5 cm high, bear as a rule small open flowers, and may 



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