1922] Setchell-Goodspeed-Clausen : Nicotiana Tahacum 465 



those of any other Tahacum variety, and in this respect are in direct 

 contrast to those of macrophylla. The lobes are unequal and give a 

 slight suggestion of zygomorphism to the corolla. The stamens are 

 inserted on the lower portion of the tube and are usually slightly ex- 

 serted in anthesis. The pistil possesses the usual 2-celled ovary, long, 

 slender style, and thick, slightly bilobed stigma, more or less exserted 

 in late anthesis, characteristic of the genus Nicotiana. The color of 

 the corolla is a light, though lively, pink, much lighter than the red of 

 macrophylla. The capsule at maturity is slightly flattened longitud- 

 inally, is broadly lanceolate in profile, tapers above into an acuminate 

 apex, and is about 25 mm. high and 8 to 9 mm. thick. It is the most 

 slender of all the capsules borne by the various Tahacum varieties 

 and in decided contrast to the stout capsule of macrophylla. 



In plate 55, figure 1, is illustrated a plant of angustifolia at the 

 height of its blooming period. Typical features of the plant are shown 

 in the line drawings of plate 56. Photographs of typical leaves are 

 shown in plate 58, where they may be compared with photographs of 

 the leaves of macrophylla. Photographs of the flowers are reproduced 

 in plate 60, where they may be compared with those of macrophylla 

 and of the hybrids between these two varieties. 



Macrophylla, U. C. B. G. 22/07, has already been discussed and 

 figured by one of us (cf. Setchell, loc. cit.). The original seed was 

 obtained from Comes, but the plants do not correspond to his figures 

 (cf. Comes, 1899, pi. VIII) either as to habit or shape of leaf. They 

 differ also from his description in these same respects. The flower, 

 however, agrees, and it seems best to retain for it the name under which 

 we have cultivated it. 



The habit and height of macrophylla are both very similar to those 

 of angustifolia. The habit is low corymbose, the central axis bearing 

 a panicle of corymbose racemes and the laterals arising one after the 

 other bearing similar inflorescences and equaling or overtopping the 

 central axis. The stems and branches are stouter than those of angus- 

 tifolia, however, and this, together with the broader, more solid looking 

 leaves which do not droop so much as those of angustifolia, give a 

 mature plant of macrophylla a much more robust appearance than is 

 the case Math a mature plant of angustifolia. The plant figured in the 

 first number of this volume (pi. 6) was young. An older plant shown 

 herewith on plate 55, figure 2, is in full blossom and beginning to ripen 

 its capsules, and gives a better idea of the habit of a well grown plant. 



