VASCULAR PLANTS OF NORTH DAKOTA 45 



Leeds, Butte, Minot. 



1078. Aster laevis var. sourisensis Lunell in Bull. Leeds 

 Herb. No. 2, p. 8. (1908). 



Minot. 



1079. Aster laevis var. undulatifolius Lunell in Bull. Leeds 

 Herb. No. 2, p. 8. (1908). 



Saskatchewan and adjoining N. D. territory. 



1080. Aster junceus Ait. Hort. Kew 3: 204. (1789). 

 Butte, Pleasant Lake, Towner. 



Salicifolii. Analytical Key. 

 A. Inflorescence a much branched panicle with numerous heads. 

 B. Leaves distinctly dentate both on the stem and on the 



branches 1. A. chelonicus sp. nov. 



B. Leaves on the stem dentate (or often entire in no 3 !, on the 

 branches entire. 

 C. Disk of the head about 1 cm. high; leaves thick and firm. 

 D. Heads thyrsoid or racemose — glomerate on ascending 



branches; bracts with acute or obtusish tips 2. A. salicifolius 



D. Heads in a more naked inflorescence, bracts with 



narrower acute or acutish tips 3 A. caerulescens 



C. Disk of the head 6-8 mm. high; leaves membranous. 



E. Leaves lanceolate or oblanceolate; rays white 4. A. paniculatus 

 E- Leaves narrowly lanceolate; rays purplish 



5. A. paniculatus var. polychrous var. nov. 

 C. Disk of the head 5 mm. high.. .6. A. lautus var. prionoides var. nov 



B. Leaves entire; disk of the head 5 mm. high.. 7. A. lautus 



A. Inflorescence a narrow panicle with comparitively few heads. 



E. Bracts with white midribs '. 8. A. laetevirens 



E. Bracts without white midribs. 



F. Disk of the head 1 cm. high; rays blue 9. A. divorum sp. nov. 

 F. Disk of the head 6-8 mm. high; rays white or pale 

 pink or dark to violet purple. 

 G. Branches short, convergent, leaves short, usually 



with partly denticulate margins... 10. A. Jacobaeus sp. nov. 

 G. Branches longer, erect or even divaricate; leaves 



elongated, usually with entire margins ..11. .4. durus 



108 1. Aster chelonicus Lunell, sp. nov. 



Planta rhizomate horizontali perennis. Caulis robustus, 

 ruber, 5-6 dm. altus, internodiis ramorum 1. 5-3 cm. longis. Rami 

 primarii longitudine variabillimi. Partes plantae omnes conspicue 

 confertae. Folia crassa firmaque, acuminata, sessilia, brevia 

 lataque, lanceolata, caulina 6-8 cm. longa, 1.5-2 cm. lata, ramorum 

 2-4 cm. longa, 0.7-1 cm. lata, et caulis et ramorum conspicue dentata 

 neque apicem versus abrupte reducta, in axillis folia plurima 



