OF ARTS AND SCIENCES : OCTOBER 14, 1862. 79 



+- H— Hairs of the base of the Jlower slightly or one half shojier than 

 the membranaceous loiver pulea and commonly surpassed by those 

 of the rudiment : awn stout, divergent or bent when dry, but not 

 twisted, not surpassing the glumes. Culms tall: leaves broad and 

 flat. Eastern United States. 



6. C. CONFINIS, Nutt. Panicle elongated, its rather slender branches 

 spreading in anthesis but soon oppressed ; glumes oblong-lanceolate 

 and very acute, 2 lines long ; hairs copious, slightly or one third short- 

 er than the thin-membranaceous lower palea, which bears an awn 

 much below its middle ; grain glabrous. — In swamps, Pennsylvania 

 and New York. 



7. C. NuTTALLiAXA, Stcud. (C coarctctta, Torr., not of Kunth 

 under Deyeuxia.) Panicle contracted and spike-like ; glumes lanceo- 

 late and subulately long-acuminate, serrulate-scabrous on the keel, 

 fully 3 lines long ; hairs of the base of the flower scanty and barely 

 half the length of the chartaceous-membranaceous and keeled lower 

 palea on the dorsal side, longer on the other side, where they nearly 

 equal those of the copious tuft at the summit of the otherwise naked 

 rudiment; awn from half-way between the middle and the tapering 

 summit of the palea; grain crowned with a bearded tuft. — Moist 

 grounds, Massachusetts to North Carolina. 



-)--)—-{- Hairs of the base of the flower short and commonly not copi- 

 ous, not reaching to the middle of the lower palea, at least on the 

 lower side of the floiver : aion from toioards the base of the firm- 

 membranaceous jjalea, mostly bent or diverging above, spirally 

 twisted when dry. Leaves usually flat. 



8. C. PoRTERi, n. sp. Leaves broadly linear, a woolly-bearded ring 

 at the junction with the sheath ; panicle elongated, linear, with the 

 branches appressed ; glumes lanceolate, barely acute, pale, and rather 

 scarious, 2 or 24- lines long ; hairs of the flower and of the short rudi- 

 ment scanty, nearly equal in length on the upper side of the flower 

 and attaining about its middle, very short or wanting on the lower 

 side ; awn equalling the palea, suprabasilar, twisted. — Huntingdon 

 County, Pennsylvania, at Pulpit Eocks, and between Alexandria and 

 Huntingdon, in the mountain region, on wooded and dry hillsides, Aug. 

 18G2, Prof. Thomas C. Porter. Stems 2 to 4 feet high. Leaves 2 to Sp- 

 lines wide, tapering gradually to a slender point. Panicle 5 to 6 inches 

 long, not purplish. This is an American analogue of G. varia or mon- 

 tana of Europe ; but in that the glumes are more acute, the beard of 

 tlie rudiment far longer and more copious, and the awn lon"-er. 



