110 MISSOURI BOTANICAL GARDEN BULLETIN 



collected by Mr. John II. Kellogg at Arkansas Post, on the 

 Arkansas River, were planted in the Garden. In 1918 seeds 

 of the same variety, No. 44103, were sent to the Garden by 

 the Department of Agriculture for trial. The plants have 

 done exceedingly well, producing masses of yellow flowers 

 from about the middle of August until killed by frost (see 

 pl. 20). 



NEW HYBRID SPIRAEA 



An interesting hybrid spiraea between Spiraea salicifolia 

 and S. Douglasii has recently appeared in the North American 

 tract where large masses of the parent plants are grown. The 

 new hybrid is a shrub 3|/> to 4 feet high, with yellowish brown 

 stem. The leaves are oblong-lanceolate to lanceolate, smooth 

 on both sides, green above, paler on the under side, deeply 

 and sharply serrate. The stamens are twice as long as tin- 

 petals. The sepals are upright in fruit. The flowers are 

 light rose-pink upon spreading racemes. 



This new plant resembles 8. salicifolia in the spreading 

 inflorescence, upright growth, and the light green color of 

 the under side of the leaves. The serrations along the margins 

 are more intensified, however, extending almost to the petiole. 

 The color of the flowers is intermediate between that of the 

 two parents. Spiraea BUlardi of the trade is derived from 

 the same parents as the Garden hybrid but in general char- 

 acters, such as color of flowers, shape of inflorescence or flower 

 spike, and leaves, resembles 8. Douglasii. Its habit of growth, 

 however, is not pendent as in mature plants of 8. Douglasii 

 but upright as in S. salicifolia. 



HARDY EXOTIC PLANTS SUITABLE FOR THE 

 GARDENS OF MISSOURI AND ADJOINING STATES 



(Continued from September Bulletin) 



XI. PERENNIAL PLANTS FOR NATURALIZING 

 Annrn-v Pnlnr nf Appi'OX. 



Botanical name Common name height flowers time of Habitat 



Achillea Eupatorium.Yarrow 1-2' Yellow. . . July-Sept. Europe 



Achillea [Hi pendul nurYarrow 6-18" Yellow. . . June-Sept. Orient 



Achillea macrophylla.YHXTOW 2-3' Yellow. . . July- Aug. Europe 



Achillea 



Tournefortii Yarrow 1-1 y 2 ' Pale 



yellow. June- Aug. Greece 



