ERIGERON IN NORTH DAKOTA 3 



8. Erigeron as per var. appressus var. nov. 



Vide Clavem analyticam. 



The character mentioned in the key seems to make the only 

 difference from the species, as described in the Midi. Nat. II (p. 254). 

 The variety was collected on low prairie at Dickinson, Stark 

 County, on June 16, 19 12, by Mr. Clarence H. Waldron. 



9. Erigeron abruptorum sp. nov. 



Caulis solitarii, simplices, i usque 2-(interdum 3 usque 4-) 

 capitati, 20-30 cm. alti, pilis diffusis vel magis minusve appressis 

 copiose usque tenuiter vestiti. Distinctio laminarum et petiolorum 

 foliorum magis conspicua, lamina quidem ad laminas propin- 

 quorum latiore. Folia adpresse pilosa, radicalia late usque anguste 

 ovalia, serrato-dentata, apice acuta vel retusa, in petiolos alatos 

 ad longitudinem laminarum prope accedentes sensim reducta. 

 Folia cauiina inferiora lanceolata usque late lanceolata, serrato- 

 dentata quoque, apice acutula, in petiolum longum sensim reducta; 

 folia sursum sensim diminuta, anguste lanceolata, longe acuminata, 

 integra, sessilia. Capitula circiter 2 cm. diametro (radiis albis 

 inclusis) . 



Stem single and simple, i to 2- (sometimes even 3 to 4-) headed, 

 20-30 cm. high, abundantly to scantily covered with spreading 

 or more or less appressed hairs. The foliage of this species is more 

 differentiated into lamina and petiole, the lamina broader in pro- 

 portion than is the case with its relatives, and appressed-hairy. 

 Radical leaves broadly to narrowly oval, serrate-dentate, acute 

 or blunt at the apex, tapering into winged petioles of approxi- 

 mately the same length as the lamina. Lower stem leaves lanceo- 

 late to broadly lanceolate, also serrate-dentate, with acutish 

 apex and tapering into a long petiole; the leaves are gradually 

 reduced in size upwards, narrowly lanceolate, long-acuminate, 

 entire, sessile. Heads about 2 cm. in diameter, including the 

 white rays. 



Collected by the writer on top of a high bluff, on June 19, 

 1912, at Butte, Benson County. 



10. Erigeron oxyodontus sp. nov. 



Caules simplices, plerumque 3-capitati, 30-35 cm. alti, pu- 

 bescentes, foliis tenuiter vestiti. Folia dimidiae partis superioris 

 anguste linearia, integra, longe acuminata, dimidiae partis inferioris 



