EFFECTS OF EXPOSING GERM-CELLS TO RAYS OF RADIUM 249 



Rosette leaves finely and rather copiously pubescent, the longer ones 

 9-10 cm. long; blades oblong to oblong-spatulate, undulate, longer than 

 the petioles; stems 3 dm. tall, with very long spreading branches on the 

 lower part; stem-leaves spreading; blades oblong to oblong-linear, acute 

 at the apex, shallowly undulate-sinuate; bracts similar to the stem-leaves 

 but much smaller; hypanthium 35-45 mm. long; sepals about 15 mm. 

 long or shorter, one half as long as the free portion of the hypanthium, the 

 free tips in the bud stout, 1-1.5 mm. long; petals 15 mm. long, or smaller, 

 nearly truncate at the apex; capsules columnar, slightly tapering to the 

 apex, about 20 mm. long, rather broader than the bracts. (See plate 12, 

 FIGURES f-k.) 



The second specimen (plates 1 1 and 12) is equally as distinctive. 

 The spreading tips of the calyx in the bud (plate 12, figures c and 

 d) indicate the pressure of the stigmatic lobes within, and in many of 

 the buds these lobes force their way through the tip some time before 

 anthesis, a feature seldom, if ever, observed in biennis, and favor- 

 ing cross-pollination instead of the close pollination characteristic of 

 biennis. The plant, about 6 dm. tall at maturity, produced flowers, 

 fruit, and seed in great abundance. The leaves were of a slightly 

 darker green than is usual in biennis, and both they and the bracts are 



Fig. 72. Onagra biennis. Radium Culture, No. I5rt. Two Rosettes, one narrow 

 leaved, and one broad leaved, on one Tap-Root. Cf. figure 73, and plates 13 

 and 14. 



