Hitchcock — 'I'hc Grasses of Ila-waii 125 



commonly persistent : glumes somewhat uiieqnal. shorter than the first lemma, acute or acuminate, 

 i-nerved, or the second rarely .^'i^'rvcd : lemmas acute or acuminate, keeled or rounded on the 

 back. 3-nerved. the nerves as a rule prominent: palca ,2-nerved, the keels in some species ciliate. 

 Annual or perennial grasses of various habit, the inflorescence an open or contracted ixuiicle. 

 Plants annual ; introduced species. 



Palea prominently ciliate on the keels, the hairs about 0.3 mm. long i. E. amabilis. 



Palea not ])rominentlv ciliate on the keels. 



TA'mmas glandular on the keel : 2. E. cilianensis. 



Lemmas not glandular. 



Spikelets as much as 2 cm. long^, densely many-flowered .V E. falcata. 



Spikelets less than i cm. long, lo<3sely few to T2-flowered. 



Palea remaining- on the rachilla after the fall of the leiuma : spikelets appresscd 



on the branchlets 4. E. caroliniana. 



Palea and lemma deciduous from the rachilla; spikelets on long ascending 



pedicels 3. E. abyssinica. 



Plants percmu'al. 



Cree]iing rhizomes short and stout, the culms in loose tufts 6. E. atropioides. 



Creeping rhizomes wanting, the culms in compact tufts. 



Pedicels slender, straight, stififly ascending, mostly longer than the spikelets 



7. E. mauiensis. 



Pedicels mostly shorter than the spikelets, if longer then flexuous. 



Lower branch of the open panicle .solitary; spikelets about 2 mm. wide 



8. E. brownei. 



Lower branches of panicle several in a fascicle, or the panicles narrow and spike- 

 like, obscuring the fascicles. 

 Branches of the open panicle deflexed at maturity; blades mostly less than 



4 mm. wide 9. E. deflexa, 



Piranches of ]ianicle not deflexed ; panicle usually contracted, if open the blades 

 mostly more than 5 mm. wide. 

 Plants tall and stout, usuall}' over i meter tall ; panicles oblong, rather 

 open ; blades flat, usually more than 5 mm. wide, in some speci- 

 mens as nuich as I cm. wide 10. E. grandis. 



Plants mostly less than i meter tall, many low or slender ; panicles con- 

 tracted, or even spikelike. 

 Culms low, slender, tufted, mostly less than 30 cm. tall ; blades 

 slender, involute, mostly basal ; panicles narrow but not very 



dense, mostly 5 to 15 cm. long 11. E. monticola. 



Culms tall, slender or stout, commonly as much as i meter tall, some 

 lower but stout. 

 Culms tall and slender : l>lades slender, involute, ateut i mm. 

 wide wdien rolled; panicles slender and spikelike, 15 to 



30 cm. long 12. E. leptophylla. 



Culms stout ; blades mostly more than 5 mm. wide, flat or becom- 

 ing involute at the tips ; panicle stout, compact or some- 



wdiat open, as much as 40 cm. long 13. E. variabilis. 



I. Eragrostis amabilis i L. I Wight & Arn. ; Hook. & .\rn. Bot. Beechey ^'oy. 251. 1841. 

 Poa amabilis L. Sp. PI. 68. 1733. 

 Eragrostis pluiiwsa Link, Hort. Berol. i :i92. 1827. 



Plants annual; culms erect or spreading and geniculate at base, slender. 10 to 30 cm. 

 tall, glabrous ; sheaths glabrous, pilose at the throat ; blades flat, lax, striate, mostlj' less than 

 10 cm. long, 2 to 4 mm. wide; panicle oblong, or elliptic, 5 to 15 cm. long, 3 to 6 cm. wide, 

 open, the branches ascending or spreading, ]iilose in the axils, slender, the pedicels finally 

 spreading, mostly as long as the spikelet or longer ; spikelets i .5 to 2 mm. long, mostly 4 to 

 6-flowered, the rachilla joints finally disarticulating; glumes broad, nearly equal, about i mm. 

 long; lemmas obtuse, about i mm. long; palea as long as the lemma, prominently ciliate, the hairs 

 straight, rather distant, about 0.3 mm. long (fig. 12). 



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