r s. 



434 TRANS. OF THE ACAD. OF SCIENCE. 



** Triandri. 



6. J. procerus, E. Mey.(?), California. 



7. J. effusus, Lin., over the whole country.* 



(i. Graciliores, floribus plerumque pau- 



cioribus, saepe viridulis, sepa- / _ 

 lis fructiferis saepe patentibus, [ o 

 capsula subglobosa. I | 



1. Aphylli. / c 



8. J. patens, E. Mey., California. 



9. J. filifortnis, Lin., northward. 



2. Foliiferi, 



10. J. Smithii, n. sp., Pennsylvania. 



11. J. setaceus, Rostk., Virginia to Louisiana. 



b. Pauciflori, panicula vix usquam composita. 

 a. Apiculati. 



12. J. arcticus, Willd., Greenland. 

 Sub-sp. /. Sitchensis, north-western coast. 



j3. Caudati. 



1. Aphylli. 



13. J. Drummondii, E. Mey., Rocky Mountains and north- 



westward. 



2. Foliiferi. 



14. J. Hallii, n. sp., Colorado. 



15. J. Parryi, n. sp., Rocky Mountains, and mountains of 



California and Oregon. 



II. Junci graminifolii, caule nudo seu foliato ; foliis planis seu 

 semi-teretibus canaliculatis seu raro sub-teretibus. 



A. Macrospermi, alpini, seminibus paucis magnis cau- 



datis, foliis fistulosis. 



a. Pauciflori. 



16. J. trifidus, Lin., north-eastern mountains. 



17. J. biglumis, Lin., Arctic regions. 



b. Capitellati. 



18. J. triglumis, Lin., Rocky Mountains to Arctic regions. 



19. J. stygius, Lin., Western New York to Maine and New 



Brunswick. 



20. /. castaneus, Smith, Rocky Mountains to Arctic regions. 



B. Singuliflori. 



a. Simpiices, nudicaules, erecti. 



a. Caudati. i >-3 



21. J. Vaseyi, n. sp., Lake Michigan to Colorado. f § 



22. J. Greenii, Oakes & Tuck., New England. > 2 



* The triandrous J. Pijlcei, La Harpe, which is entirely unknown to me> 

 seems to belong here or near J. arcticus. 



