ERIGERON IN NORTH DAKOTA 5 



hairs being the feature of this variety, it was collected by the writer 

 on June 24, 1906, in low meadow at Leeds, Benson County. 



13. Erigeron subcostatus sp. no v. 



Caulis solitarius, simplex, erectus vel leviter ascendens, i 

 usque 4-capitatus, circiter 50 cm. altus, pubescentia brevi, tenui, 

 alba, adpressa et foliis 8-12 vestitus. Folia radicalia et caulina 

 inferiora lanceolata usque late lanceolata vel oblanceolata, Integra 

 vel remote denticulata, acuminata, in petiolum alatum angustata, 

 adpresse pilosa, venis duobus lateralibus per totam laminae longi- 

 tudinem conspicue currentibus, etsi in aliquot foliis aliquantulum 

 obscuris. Folia superiora angustius lanceolata, sursum reducta, 

 sessilia, gracillime acuminata, integra. Capitula solitaria vel 

 corymbosa, 2-3 cm. diametro (radiis inclusis), 7-10 mm. alta. 

 Bracteae lineari-acuminatae, late scarioso-marginatae, laxiores, 

 indumento albo appresso vestitae. Radii 130-150, albi, lati. 



Stem single, simple, erect or slightly ascending, i to 4-headed, 

 about 50 cm. high, with a short, scanty, white, appressed pubes- 

 cence, and 8-12 leaves. Radical and lower cauline leaves lan- 

 ceolate to broadly lanceolate or oblanceolate, entire or distantly 

 denticulate, acuminate, tapering into a winged petiole, appressedly 

 hairy," with two lateral veins running quite prominently through 

 the entire length of the lamina, though the venation is some- 

 what obscure in part of the leaves. Upper leaves more narrowly 

 lanceolate, reduced in size upwards, sessile, slenderly acuminate, 

 entire. Heads single or corymbose, 2-3 cm. across (including 

 the rays), 7-10 mm. high. Bracts linear-acuminate, broadly 

 scarious-margined, with a white, appressed indument, quite loose. 

 Rays white, 130-150, broad, rather short for the disk. 



The large heads, the white, broad, rather short rays, and the 

 thin, 3-nerved, partly denticulate leaves are a combination of 

 characters distinguishing this daisy from kindred species. It 

 was collected in shade along the Heart River, a tributary of the 

 Missouri, at Dickinson, Stark County, on June 23, 191 2, by Mr. 

 Clarence H. Waldron. 



14. Erigeron procerus sp. nov. 



Caules 1-2, simplices, 2 usque 4-capitati, 35-40 cm. alti, 



pubescentia densa, paene appressa pilorum inaequalium provisi. 



Folia radicalia spatulata, caulina inferiora lanceolata vel anguste 



lanceolata, omnia acuta, petiolis laminae aequalibus ornata, 



