Article (misc)  (1953)  Page(s) 171.  
 
Rosa laxa We have two forms of this, both of which are desirable shrubs. The form we dubbed 'Morden' came from the Morden Experimental Station. The strongly upright plant is viciously spiny and is well furnished with blue-green foliage. The single, white flowers are 3 inches in diameter and are followed by brilliant scarlet , flask-shaped fruits. 6' x 3'. The other form we obtained from Mr. Percy H. Wright under the label R. laxa, fall-blooming form. It is like the Morden form in all respects but two. The flowers are pale pink changing to white after opening and the plant is much more dwarf, 3'x3'.

Magazine  (1949)  Page(s) 197 Mar-April.  
 
In Breeding For Hardiness by F. L. Skinner:
Until quite recently the rose usually sent out as Rosa laxa was a variety of R. canina, one not quite hardy in the Great Plains region of this continent. This is probably the reason why the true R. laxa has been so long neglected by American rose breeders. The true R. laxa (of Retz.) is a native of Turkestan and Soongaria and is a strong-growing bush from five to seven feet high and well armed with stout, recurved spines; its flowers are white, very freely produced late in June in clusters of three to five and continuing in smaller numbers until September. It is absolutely hardy at Dropmore in Manitoba, and at the Federal Horticultural Field Station, Cheyenne, Wyoming, where so few roses are really happy, it seems quite thrifty.

Website/Catalog  (1949)  Page(s) 12.  
 
"ROSA LAXA, RETZIUS - a Siberian rose, often called "Hansen's Siberian Hedge Rose," like our wild roses, but taller growing. Suitable for a hedge except that it suckers too freely. Small round hips, in profusion, highly ornamental in fall and winter."

ROSA LAXA ALBA - apparently not really closely related to the foregoing, for it has long, bottle-shaped hips and white flowers.

ROSA LAXA ALBA, FALL-BLOOMING FORM - possibly a hybrid; has fertile pollen and should be useful for breeding. Sent to me by Dr. F. L. Skinner."

Book  (Jan 1946)  Page(s) 31.  
 
R. laxa, Retz. A native of Siberia. It is covered with white flowers, followed by orange fruits which turn dark red as they ripen. It forms a very ornamental shrub to five feet in height.

Book  (Jul 1938)  Page(s) 87.  
 
R. laxa - Closely related to R. cinnamomea. At Beaverlodge, where plants were received in 1930, from Dr. N. E. Hansen of South Dakota, it is half-hardy and bushes have attained a height of 5-6 feet with a spread about as much. Flowers white. Said to be quite hardy at Wilkie, Sask. Non-suckering and worth investigation for rootstock purposes.

Book  (1937)  Page(s) 73.  
 
laxa Retz. (cinnamomea-race) [ploidy] 28

Book  (1934)  Page(s) 303.  
 
Laxa (species).- Yellowish white; vigorous; dwarf; prune lightly; small, single, greyish green foliage.

Book  (1933)  Page(s) 62.  
 
R. laxa - Siberia. Supposed to be a spontaneous hybrid of canina and spinosissima altaica. Extensively used as understock in Europe. When in bloom in June it is a solid sheet of white flowers. In late August the great quantity of fair-sizes fruits begin to turn orange, then red, and finally brilliant scarlet, remaining most of the winter. One of the most ornamental species in bloom and fruit. Large shrub five feet high, upright and compact.

Book  (1929)  Page(s) 36.  
 
'Semi Rose' - Introduced by N. E. Hansen, 1927. A tall growing upright shrub, fully eight feet in height, with hooked prickles in pairs. Flowers, small, white, blooming all summer, followed by bright red fruits. This is Rosa laxa, Retz., grown from seed collected in 1913 on the dry steppes of Semipalatinsk, Siberia. The plant may prove useful as a budding stock for other roses or for hedges and screens. An occasional bush has light pink flowers. This interesting wild rose has been described under many synonyms. The present name is given it to distinguish it from other importations. Native of the Altai region. It should not be confused with Rosa laxa, Lindl., which is a variety of Rosa blanda, Ait. The name 'Semi', is an abbreviation of Semipalatinsk, where the seed was collected by N. E. Hansen in 1913.

Book  (1927)  Page(s) 227.  
 
Semi A tall growing upright shrub growing 8 feet; flowers small, white, blooming all summer. This is Rosa laxa Retz. growing from seed collected by Prof. N. E. Hansen in 1913 on the dry steppes of Semipalatinsk, Siberia. The present name is given it to distinguish it from other importations. Native to the Altai Mountains and extending westward to the Semipalatinsk region. It should not be confused with Rosa laxa Lindl., which is a variety of Rosa blanda Ait.