THE SPECIES PROBLEM IN IRIS EDGAR ANDERSON Geneticist to the Missouri Botanical GardenProfessor of Botany in the Henry Shaw School of Botany of Washington University I. INTRODUCTION As a biological phenomenon the species problem is worthy ofserious study as an end in itself, and not as a mere corollary towork in some other field. It is, to be sure, a problem so funda-mentally important that it touches many such fields. Workersin any one of these are humanly prone to regard the evidencefrom that field as all important and its techniques as all suffi-cient (particularly if they are themselves unacquainted withother aspects of the problem). When, however, one takes up theproblem, as a problem, and studies it from the diverse view-points of genetics, taxonomy, cytology, and biometry, he real-izes that he not only needs most of the existing techniques butthat he must devise new ones as well. Iris versicolor and Iris virginica were chosen for such astudy since they customarily grow in colonies containing manyindividual plants; a peculiarity which facilitates the locationand study of large numbers of individuals. A preliminaryanalysis of the problem ('28) and a discussion of certain pointsconnected with the distribution of these species ('33) havealready appeared. The following series of papers constitutesa final comprehensive report. The central core of informationis an analysis of a precise morphological census of the twospecies (section IV). For the interpretation of this morpho-logical data it has been necessary to undertake correlatedinvestigations in cytology, taxonomy, glacial geology, and ge-netics. A technical taxonomic treatment of these irises, to-gether with the related Iris setosa, is assembled in sectionII, although material indirectly of taxonomic interest will befound in sections III and V. The phylogenetic relationship ofIris versicolor to Iris virginica has proved to be somewhat ex-ANN. Mo. BOT. GARD., VOL. 23, 1936.(457)



The Species Problem in Iris

Edgar Anderson
Annals of the Missouri Botanical Garden 23: 457-509 (1936)

Reference added over 6 years ago



Page 457
Page 458
Page 459
Page 460
Page 461
Page 462
Page 463
Page 464
Page 465
Page 466
Page 467
Page 468
Page 469
Plate 22
Page 471
Page 472
Page 473
Page 474
Page 475
Page 476
Page 477
Page 478
Plate 23
Page 479
Page 480
Page 481
Page 482
Page 483
Page 484
Page 485
Plate 24
Page 487
Page 488
Page 489
Page 490
Page 491
Page 492
Page 493
Page 494
Page 495
Page 496
Page 497
Page 498
Page 499
Page 500
Page 501
Page 503
Page 504
Page 505
Page 506
Page 507
Page 508
Page 509
One author per line, "First name Last name" or "Last name, First name"
Starting page
Ending page
blog comments powered by Disqus
Page loaded in 2.92483 seconds