. Bursa bursa-pastoris and Bursa heegeri biotypes and hybrids. Bursa heegeri; Plant hybridization. BIOTYPES AND HYBRIDS. 23 more characteristic specimens oi B. bp. rhomboidea secured in hybrid fam- ines. These two individuals were growing in a situation which received only the morning sun. The leaves were divided to the midrib, but the oblong, obtuse lateral lobes frequently had no incisions, though in some cases the middle lobes of the leaves had the more characteristic incision on the distal margin and less frequently a similar incision occurred on the proximal margin. The lobes were rather
. Bursa bursa-pastoris and Bursa heegeri biotypes and hybrids. Bursa heegeri; Plant hybridization. BIOTYPES AND HYBRIDS. 23 more characteristic specimens oi B. bp. rhomboidea secured in hybrid fam- ines. These two individuals were growing in a situation which received only the morning sun. The leaves were divided to the midrib, but the oblong, obtuse lateral lobes frequently had no incisions, though in some cases the middle lobes of the leaves had the more characteristic incision on the distal margin and less frequently a similar incision occurred on the proximal margin. The lobes were rather distant from each other, giving a very unique appearance to these plants. Seeds of these two supposed sibs were sown on June 6 and 14, 1905. The first of these () pro- duced 65 offspring, which were studied in their relation to different condi- tions of environment in order to get a clue to the suscepti- bility of Bursa to immediate modification by variations in the chemical and physical con- ditions of the soil, differences in soil-moisture, atmospheric^ humidity, intensity of light, etc. Specixnens which were grown under as favorable conditions as the sky-lighted room pro- vided were essentially identi- cal with the parent (fig. 12). Aside from the complete sup- pression of lobes and long delay of the flowering period in dim light (figs. 13 and 14), ^'^^ l^-—Bursa bursa-pastoris rhomboidea. A sib the most marked effect of en- °^ P'^f'^ ^.''°^" ''" ^S^- }^ ^""^ ^^' ^"^^ °f ^^e same -, . - age, showing the complete suppression of lobes. vironment was noted m plants ^^.^ ^^^^^ ^^^ g^^^„ ^^^ ^^^ ^^^^^^ i^ ^ p^^^,y kept in a nearly saturated illuminated corner of the sky-lighted room, atmosphere attained by cov- ering with glass jars. The leaves became long, of very thin membranous texture, crinkled and otherwise distorted, and with very shallow sinuses (fig. 15). Plants which had been grown in the dim light of the sky-lighted room of the labor
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectplanthybridization
