78 PROCEEDINGS OF THE ACADEMY OF 



forma typica. 605. C. filifolia, Nutt. ; the ordinary form. [Parry's 442 is 

 a high alpine form of the same species.] 



606. Carex obtusata, Lil. 607. C. pauciflora, Lightf. 608. C. Pyrenaica, 

 Wahl. 609. C. nigricans, C. A. Meyer. 610. C. scirpoidea, Michx. 611. 

 C. Geyeri, Boott. 612. C. Backii, Boott. 613. C. capillaris, L. 



614. Carex longirostris, Torr., var. minor ; culmo brevi ; spicis abbrevi- 

 atis ; rostro breviore. 615. C. ampullacea, L. (utriculata, Boott.) 616. C. 

 Jamesii, Torr. and C. angpstata, Boott, mixed. 617. C. Parryana, Dewey. 

 Some specimens have two spikes, the terminal masculine ; others have either 

 one or two spikes, both wholly feminine. 618. C. alpina, Sm. ( Vahlii, 

 Schk.) 619. C. Bctxbaumii, Wahl. 620. C. Rgssii, Boott. 



GR AMINES* 



621. An ambiguous and undetermined Grass, between Festuca and Melica. 

 622. Danthoxia sericea, Nutt. [Z>. unispicata, Munro, ined., is a reduced form 

 of this, to which belongs Geyer's No. 189.] 623. Avena striata, Michx. 

 624. Calamagrostis sylvatica, DC. 625. Trisetum subspicatum, Beauv., 

 with a remarkable open-panicled form. 626. Stipa viridula, Trim, the S. 

 parviflora, Nutt. 627. Aira c^espitosa, L., two forms ; the smaller and more 

 alpiue of which is the var. arctica [Deschampsia brevifolia, R. Br.) ; the larger is 

 intermediate between that and the ordinary form of the species. Parry's 367 

 of 1862 connects the two. 



628. Hierochloa borealis, R. and S. 629. Glyceria aquatica, Smith. 

 630. G. (Heleochloa) airoides, Thurb., the Poa airoides, Nutt. 



631. Vilfa tricholepis, Torr. ; a remarkable species, which it may be 

 necessary upon further study to remove from the genus. 632. Muhlenber- 

 gia pungens, n. sp.f 633. Eriocoma cuspidata, Nutt. 634. Oryzopsis 

 micrantha ; Urachne micrantha, Trin. A very distinct species, differing from 

 O. Canadensis, Torr., in its elongated panicle, smaller spikelets, glabrous 

 paleae, and much longer awn. 635. Graphephorum? flexttosum, n. sp.J 

 636. Bouteloua oligostachya Torr. 637. Buchue dactyloides, Engelm. 

 leria, Nutt.) ; the staminate plant only. 638. Mcnroa squarrosa, Torr. 



639. Spartina gracilis, Trin. ; the name wrongly attributed to Hooker by 

 Steudel ; it is S. junciformis, Engelm. and Gray, PL Lindl. 1, No. 207. 



640. Brizopyrum spicatum, Hook, var. strictum. 



641. Sporobolus asperifolius, Nees and Meyen. 642. Muhlenbergia 

 gracillima, Torr. 643. Sporobolus ramulosus, HBK. 644. Leptochloa 

 fascicularis, Gray ; a remarkable and large form ; which has been by seve- 



* By Prnf. George. Thurber. On account of illness, Prof. Thurber has been prevented from study- 

 ing these Grasses as thoroughly as could be wished. A more critical account of some of them may 

 be expected hereafter. 



f- Muhlenbergia pcngens (Thurber, sp. nov.) : culmo e rhizomate repente 1-li-pedali foliisque 

 rigidis convolutis pungentibus patentibus (1-1 i poll, longis haud lineam latis) minute pubescenti- 

 bus, ligula brevi ciliata ; paniculse 3-4-pollicaris radiis solitariis dissitis basi nudis fasciculatim ramo- 

 sls; pedicellis capillaribus scabris spiculis (cum arista 2j lin. longis) pluries longioribus; glumis 

 fere aequalibus acuminatis vel seta apiculatis flore dimidio brevioribus; callonudo rudimento mini- 

 mo przedito; palea inferiori scabra acuta in aristam asperam semi-vel sublineam longam pro- 

 ducta. superiori subeequilonga, nervis excurrentibus bisetiferis; staminibus 3. A striking spe- 

 cies, with very pale green foliage, and a purplish panicle. Collected also by Mr. H. Engelmann in 

 Nebraska, and by Dr. J. S. Newberry in Ives' Colorado Expedition. 



% Graphephorum? flexuosum (Thurber, sp. nov.): culmo tripedali lmvi; vaginis internodia 

 superantibus annulo pilorum pro ligula instructis; foliis sesquipedalibus 2 lin. latis setaceo- 

 acuminatis ; panicula laxiflora, radiis sparsis (infimis diatantibus ciro. 4 poll, longis) inferne nudis 

 in ramulos pancos capillares solutis; pedicellis spiculis ovatis compressis 3-6-floris) 2^-3 lin. longis) 

 duplo vel quadruplo longioribus; glumis mombranaceis uninerviis aoutis spicula dimidio brevi- 

 oribus; palea inferiori earinata trinervi (nervis latoralibus prominontibus) scabro-pubescente apico 

 eroso-denticulata cum mucrone basi villifera, superiori subaequilonga eximie bicarinata bidentata. 

 Stam. 3. Ovarium stipitatum. Squamulae 2, oblique truncatae. Caryopsis libera. Dr. J. M. Bige- 

 low collected this Grass several years ago on the Canadian River. It is doubtfully referred to Gra- 

 phephorum as that genus is defined by Dr. Gray in the Proceedings of the Botanical Society of 

 Canada. But the joints of the rhachis are very short, and the tuft of hairs seems rather to belong 

 to the palea. 



[Mar. 



