1144 CC. GRAMINEZE, [Agrostidea. 
sepe luto-teretil Panicula terminalis, ssepius floribunda, nune angusta tenuis- 
Sima, nunc densa thyrsoidea v. fere spiciformis, nunc laxa effusa ramulis capillaceis. 
Spieule parvz, tenues, interdum minimze ; gluma florens dorso glabra v. rarius parce 
pilosa ; arista scepius longiuscula, tenuissima, interdum curva at non torta. 
5 
Species fere 60, pro maxima parte Americante boreales v. Andinze, paucie Asise medie v, orientalis 
incole. Beauv. Agrostogr. 27, t. 7, f. 9. Schreb. Beschr. Grüs. t. 51. Kunth, Enum. Pl.i. 198. 
Steud. Syn. Pl. Glum.i. 177 (eacl. sp. plur.). Fourn. Gram. Mez. 81. — Benth. in Journ. Linn. Soc. 
xix.82. Dell in Mart. Fl. Bras. ii. iii. 40, 1. 9. Willd. Hort, Berol. t. 12 (Agrostis). 
Genus quoad species plerasque sat naturale, sed male definitum ; species alize vix a Stipa differunt 
spieulis parvis gluma fructifera minus rigida, alis ab Epicampe gluma fructifera eirea caryopsin 
aretius convoluta. Magnopere variat, panieula densa strieta v. laxe effusa, glumarum vaeuarum 
ratione ete. sed difficile in sectiones dividitur, etsi species nonnullz ab auctoribus variis generice 
separantur, In generis typo M. diffusa, Schreb, aliisque nonnullis, glum:e vaeuz minutse, infima 
haud raro ad callum vix prominulum reducta v. omnino deficiente; in sectione Acrozi, Trin., glume 
vaeus cquales v. inzquales, quarum secunda dimidium spieule v. interdum. glumam ipsam florentem 
superat. 
VasEgYa, Thurb. in Proc. Acad. Nat. Se. Philad. 1863, 79, est species Californica (M. comata, 
Thurb., speeiminibus Canadensibus JM. sylvatice in omnibus simillima, nisi pilis rhachilla sub 
gluma florente duplo longioribus et gluma ipsa paullo tenuiore. 
Poposzwtua, Desv, in Nuov. Bull. Soc. Philom. ii. 188, et in Journ. Bot. i, (1813) 67 (TaicHocnroA, 
Beauv. Agrostogr. 29, t. 8, f. 2), distinguitur imprimis panieula laxa effusa, ramulis pedicellisque 
elongatis eapillaribus. .H. B. et K. Nov. Gen. et Sp. t. 681 ad 683. 
Tosaanis, Beauv. Agrostogr. 29, t. 8, f. 3, ab auctore ipso ad Podosemum. relata, prius separata 
fuit ob glumam florentem dorso longe pilosam. Specimina non vidimus, 
CrowzNa, Beauv. Agrostogr. 28, t. 7, f. 10, est M. Clomena, "Trin. (M. nana, Benth.), species 
Andina, nana, gluma vacua secunda ceteris majore apice latiuscule 3-dentata, character pariter 
observatus in M. gracili, Trin. (CArxconowz, Nutt. in Journ. Acad, Philad. ser. 2, i. 186), aliisque 
paueis. 
114. Brachyelytrum, Beauv. Agrostogr. 39, t. 9, f. 2.—Spicule l-flore, anguste, in 
panicula tenui paucse, rhachilla supra glumas inferiores articulata, sub flore subglabra, 
ultra florem in stipitem nudum v. minute glumiferum producta, flore hermaphrodito. 
Glum:e 2 inferiores minime, vacuse, sub articulatione persistentes, extima minuta inter- 
dum vix conspicua; tertia florens elongata, 5-nervis, rigidula, acuminata, in aristam 
longam rectam producta ; palea paullo brevior, rigidula, dorso sulcata, tenuiter 9-nervis. 
Stamina 2 (v. 3?.. Styli breves, distincti, stigmatibus elongatis plumosis. Caryopsis 
oblonga, gluma paleaque involuta, libera. —Gramen elatum, foliis planis.  Panicula termi- 
nalis, angusta, ramis paucis filiformibus erectis. Spicule in subtribu longiuscul, iis 
Stipe subsimiles, rhachilla sub flore leviter callosa vix pilis paucis brevibus ciliolata. 
Species 1, Amerieze borealis incola. 4. Gray, Man. Bot. N. U. St, ed, 5, 614, 2. 8. Schreb. Beschr. 
Grüs. t. 50 (Muehlenbergia). 
115. Perieilema, Pres, Rel. Hou. i. 939, t. 97, f. a.—Spiculie l-flore, in fasciculos 
seu spicas breves secus axin panicule sessiles subsecundas densissime confertze, rhachilla 
supra glumas inferiores articulata, ultra florem non producta, flore hermaphrodito, spiculis 
tamen numerosis intermixtis sterilibus v. ananthis, Glum:e 3, tenuiter hyalinze, carinatse, 
costa omnium in aristam longam rectam producta, 2 inferiores vacus, ad basin arists 
breves nunc brevissimze ; tertia florens arista neglecta duplo longior, apice integra v. ad 
latera arist: utrinque breviter producta ; palea hyalina, 2-carinata. Stamina 3. Styli 
breves, distincti, stigmatibus plumosis. Caryopsis ovoidea v. oblonga, gluma vix riges- 
cente inclusa.—Gramina annua, csspitosa v. diffusa, foliis angustis planis. Panicula 
terminalis, spiciformis, continua v. interrupta, fasciculis spicularum minimarum seu spicis 
Rid paniule Ao 2- libus donsieucs ape AS 
aristas quasi crinitis, glumis fertilibus cum caryopsi inclusa caducis. 
.. Species 3 y. 4, Americze tropico a Brasilia et Colombia usque ad Mexicum incole. Steud. Syn. 
