Further Additions to the Revision of the Genus Juncus. 
1 p. Juncus Cooperi, n. sp. rhizomate ... foliis .... caule 
(fere bipedali) robusto rigido; spatha rigida paniculam com- 
positam strictam vix aequante; glomerulis 2-5-floris; sepalis 
demum induratis nervosis, exterioribus convexis lanceolatis 
subulato-acutatis, interioribus ovatodanceolatis mucronatis 
paulo brevioribus stamina 6 vix superantibus; antheris, late 
linearibus, filamentis brevissimis ; capsula e basi ovata acutata 
vix angulata indurata (virescente) paulo exserta; seminibus 
majoribus appendiculatis costato-reticulatis. 
Camp Cady, in the southern part of the State of California, 
Dr. J. G. Cooper, 1861.—A single incomplete specimen, pre¬ 
served in the botanical collection of the Geological Survey of 
California, discovered by the zealous naturalist whose name it 
bears, proves this plant to be closely allied to and intermedi¬ 
ate between J. acutus and J. maritimus, and therefore most 
probably leaf-bearing: The panicle is 8 inches long and 1 
inch wide, green even at full maturity; flowers with the fruit 
3 lines long, anthers If lines in length; seeds with white 
rhaphe and broad white appendages ^ line long; marked with 
irregular longitudinal reticulation. J. acutus (also found at 
San Diego by Dr. Cooper) has smaller flowers of different 
shape, and a deep brown almost globose capsule, and smaller 
differently marked seeds; J. maritimus, not yet fqund in 
North America, has all the parts _much smaller, an ovate mu- 
cronate capsule, smaller seeds with short appendages. 
J. acuminatus , var. diffusissimus, exactly corresponding 
with the Texan plant, found by the late Dr. Clapp near New 
Albany, Indiana, is preserved in Hb. Torrey. 
Missouri Botanical Garden 
flEORGE ENGELMANN PAPERS 
