Hurst's Septet Scheme

Hurst: Septet Formulae

Hurst: Septet TraitsHurst: Septet Traits in Columns

Septets and Styles

Hurst: Origin of the Moss Rose (1921)

Hurst: Chromosomes and Characters (1925) Pics

Hurst: The Conception of a Species (1927)

Hurst: The Mechanism of Heredity and Evolution (1927)

Harrison & Blackburn: Rose pollen (1927)

Hurst: Genetics of the Rose (1928)

Hurst: Differential Polyploidy (1928)

Hurst: Embryo-sac Formation (1931)

Hurst: Spontaneous Polyploids (1932)

Hurst: Polyploid Species with Pics (1932)

Gustafsson: Differential Polyploidy in Rubus (1939)

Blackhurst: Rubiginosa Hybrids (1948)

Darlington: Integrated Species Differences (1949)

Wylie: Why Caninae roses are different (1975)

Yokoya, et al. Nuclear DNA Amounts in Roses (2000)
In the Pimpinellifoliae, DNA amounts of tetraploids were disproportionately larger than those of diploids which suggests that they originated as hybrids with species of sections with larger DNA amounts. [CybeRose: i.e., differential polyploidy.]


Macfarlane: Microscopic Analysis of Hybrids (1890)

Macfarlane: Flowering Period and Vigor of Hybrids (1891)

Macfarlane: Minute Structure of Plant Hybrids (1892)

Hurst: Partial Prepotance in Paphiopedilum (1900)

Comparison of Rosa sayi Schwein. and Carman's hybrid
of 'Harison's Yellow' and R. rugosa. (1890)

Logan: Origin of the Logan berry (1902)

J. Hered.: Is the hybrid origin of the Loganberry a myth? (1916)

Anderson: Introgressive Hybridization (1949)
In the studies of introgression between these [Tradescantia] species it was not until after the artificial backcrosses had been made that we began to suspect the origin of the subaspera introgressants in T. canaliculata. These two species are strikingly different: T. canaliculata has a few long nodes, the uppermost of which are usually the longest. T. pilosa has many short nodes, and node length decreases progressively upwards. The introgressants of subaspera tend to have brilliant stems and leaves and a much higher node number than ordinary canaliculata. Though their nodes are somewhat shorter than in the latter, the extra number more than compensates, and the introgressants are frequently twice as tall as their unmongrelized sisters. These tallish, bright-stemmed canaliculata's superficially do not look at all like T. subaspera pilosa. It is only when careful studies are made of leaf shape, inflorescence characters, and pubescence that one finds that the whole complex in a greatly diluted form is tending to stay together in these peculiar variants.

Hurst: History of the Garden Roses (1941)

Gustafsson: Constitution of the Rosa canina complex (1944)

Crane & Darlington: Origin of New Forms in Rubus, I (1927)

Crane: Reproductive Versatility in Rubus. I Morphology and Inheritance

Crane & Thomas: Reproductive Versatility in Rubus. III Raspberry-Blackberry Hybrids (1949)

Britton & Hull: Mitotic instability in Rubus (1957)

Malinowski: Differential pairing, suppression of characters (1927)

Riley: Wheat Septets (1958)

Sax: Origin and Relationships of the Pomoideae (1931)

Challice: Phenolic compounds of the subfamily pomoideae (1973)