PLANTS FROM NORTH DAKOTA 343 



NEW PLANTS FROM NORTH DAKOTA— XII. 



BV J. LUNELL. 



Dodecatheon thornense sp. nov. 



Margines loborum calycis hyalini. Segmenta corollae 12-14 

 mm. longa, 3 mm. lata, rectangularia vel aliquantulum spatulata, 

 obtusa, pallide usque saturate rosea, linea obscure rosea partem 

 non divisam proxima. Haec pars lineam albam angustam exter- 

 iorem habet, deinde cum annulo parpureo fluctuoso inter basim 

 segmentorum et tubum stamineum interjecto flava fit. Filamenta 

 conjuncta 2 mm. longa. Antherae tubo filamentorum duplo 

 longiores, tergo saturate rubrae usque atropurpureae, lateribus 

 albidae. 



Calyx lobes hyaline margined. Segments of the corolla 

 12-14 mm. long, 3 mm. wide, rectangular or somewhat spatulate, 

 obtuse, varying from a pale to a deep rich rose color, with a dark 

 rose line nearest to the undivided part; this has a white, narrow 

 outer line, then becomes yellow, with a narrow, scalloped ring of 

 deep purple midways between the base of the segments and the 

 filament tube. United filaments 2 mm. long. Anthers twice as 

 long as the tube of filaments, deep red to black-purple on the 

 back, with whitish sides. For the description of the other parts 

 of the plant read page 146, vol. Ill of this journal (October 1913)- 



This plant was collected in flower on June 10, 19 14, by the 

 writer at Thorne, N. Dakota. The leaves were considerably 

 infected by a fungus, Nigredo Polemonii (Peck) Arth. I. 



The characters segregating ' it from its ally, D. pauciflorum 

 (Durand) Greene, are: segments of the corolla are of a pale to 

 deep rich, rose color, in drying changed to lilac; flowers 10-16, 

 united filaments are 2 mm. long; anthers are twice, as long as 

 the stamen tube; and the leaves differ (1. c. p. 146). D. pauci- 

 florum seems, to have lilac colored corolla segments also in the 

 fresh plant, has the united filaments at least 3 mm. long, the 

 anthers less than twice as long as the stamen tube, the flowers 

 are few, and the leaves differ (1. c. p. 146). 



This description has been added because only the fruiting 

 plant was the available material for study in writing the paper 

 of October 19 13. 



