134 



KEY TO THE FAMILIES AND GENERA 



S. Canary-Grass Tribe» or Phalarideffi. 



A. Glumo^i stiMnglv comprosseii; sterile lemmas 



nuiimentao- ■ • - ' ; -^l- Pf'dlaris. 



AA. Glumes not stronsly compressed; atenle 

 lemmas not ruilimeutary. 

 B. Sleriie lemmiis awued; glumea very unequal. 22. Anthox- 



\anthum. 

 BB. Sterile lemmas awnless; glumes nearly equal. 23. Hierocfiloif. 



6. Red-Top Tribe, or Agrostideae. 



A. Lemma indurated, or lit least firmer than the 

 glumes. 

 B. Panicle spike-like; spikeleta flattened, awn- 



le-its, 24. Ammophxla^ 



BB. Panicle not spike-like; spikelets not flat- 

 tene<I. awnea. 

 c. Floret oblong and with a sharp callus at 

 base; awn stout, geniculate, twisted, 



persistent 25. Stipa. 



cc. Floret ovate, the callus blunt; awn slen- 

 der, more or less deciduous 26. Oryzopsia. 



AA. I^mma of about the same texture aa the 

 glumes or more delicate. 

 B. Spikelets crowded in dense spike-like pani- 

 cles or heads. 



c. Heads oval, very woolly 27. Lagurus. 



cc. Heads cylindrical, not woolly 28. Phleum. 



BB. Spikelets not crowded in dense heads or 

 spikes. 

 C. Lemma and palea much more delicate 

 and shorter than the glumes, the palea 

 shorter than the lemma, often wanting. .29. Agroslia. 

 CO. Lemma and palea of about the same 

 texture as the glumes and as long or 

 longer. 

 D. Hachilla not continued beyond the base 

 of the floret; lemma awned from the 

 tip or awnless. 

 E. The lemma awned or sharp-pointed, 

 longer than the body of the awned 



or awnless glumes 30. Muehlen- 



EE. The lemma not awned or sharp- [bergia. 



pointed. 



r. Nerves of lemma 1 31. Sporobolus. 



FF. Nerves of lemma 3-5 32. Calamovilfa. 



DD. Rachilla prolonged beyond the floret as 

 a plumose bristle; lemmas awned on 



thebackandsilky hairy at base 33. C'alama- 



[grostis. 



7. Oat Tribe, or Aveneae. 



A. Plants low. delicate ; spikelets minute 34. Aira. 



AA. Plants 1 ft. or more high. 



B. Articulation below the glumes, the spikelets 

 falling entire from the pedicels. 

 c. Glumes much exceeding the 2 florets, the 



upper floret with a hook-like awn 35. Notholcus. 



cc. Glumes exceeded by the upper floret, both 



florets awnless 36. Sphenoph- 



BB. Articulation above the glumes, these per- Mia. 



aistent after the fall of the florets. 

 c. Spikelets 1 in. or more long, nodding, in 



an open panicle ; florets all alike 37. A vena. 



cc. Spikelets about '^in. long, erect in a nar- 

 row panicle; lower floret staminate 38. ArThenath' 



[eTum. 



8. Fescue Tribe, or Festuceae. 



A. Rachilla or lemma bearing long hairs as long 

 as the lemma: tall reeds. 

 B. Spikelets unisexual; male and female 

 spikelets on separate plants, 

 c. Lemmas much shorter than the glumes; 



HtH. leafy throughout . .39. Gynerium. 



CC. Lemmas with elongated delicate tips: 



IvH. crowded at the base 40. Cortaderin. 



BB. Spikelets perfect. 



c, lemmas hairy; rachilla naked 41. Arujido. 



cc.Lemmas naked; rachilla hairy 42. Phragmites. 



hj^ Rachilla or lemma glabrou.-i or hairy, but the 

 hair.') shorter than the lnmma.s. 

 B. Spikelets of 2 kinds, perfect and sterile, in 

 the same panicle. 

 c. Fertile spikelets awnless, the sterile 



awned; panicle spike-like 43. Cyno6UTU8. 



cc. Fertile spikelets awned, the sterile awn- 

 Ic*''* : panicle 1 -sided , the fascicled 



fq>ikeletH nodding 44. Lamarckia. 



BB. Spikelets all alike in the same infl. 

 c. Lemmas l-'i-nerved. 



D. The spikelets subtcrete, loosely 2— i- 



fld 45. Molinia. 



DO. The spikelets compressed, densely, 

 usually many-fld. 

 E. Florets membranaceous; spikelets in 



open panicles . 46, EragroHtis. 



EE. Florets coriaceous; spikelets in rigid 



spike-like panicles 47. Deamazeria. 



CC. Lemmas 5- to many-nerved. 



D. The spikelets with several sterile 

 lemmiis at the ba.se, strongly flat- 

 tened, in a large drooping panicle 48. Uniola, 



DD, The spikelets without sterile lemmas 

 at the base. 

 E. Florets crowded, nearly horizontal; 



spikelets broad, cordate 49. Briza, 



EB. Florets not crowded; .spikelets not 

 bro;nl ;in<l rurdate. 

 F. Spikrlfts lliilii-ned, nearly sessile in 

 dense ('lusters at the ends of the 



few panicle branches 50. DaUylxa, 



FF. Spikelets not flattened. 



G. Lemmas keeled, often bearing 

 white cobwebby hairs at 



base 5L Poa, 



OG. Lemmas convex or keeled at the 



summit only, not hairy at base. 



H. Nerves of lenmia prominent, 



parallel; lemmas scarioua at 



the summit .52. Glyceria, 



HH. Nerves of lemma not promi- 

 nent, approaching each 

 other at the apex; lemmas 

 acute. 

 I. The lemmas entire, often 



awn-tipped 53. Festuca, 



n. The lemmas 2-toothed, usu- 

 ally awned just below the 

 apex 54. Bromus* 



9. Chloris Tribe, or Chlorideae. 



A. Spikes racemose along a common axis; 



spikelets falling entire 55. SpaHma. 



AA. Spik.-s .imitate at the summit of the culm. 

 B. i">pikf|cts awnless. 



c. The spikes slender; spikelets 1-fld 56. Cynodon. 



cc. The spikes stout; spikelets several-fld 57. Eleusine. 



BB. Spikelets awned. . 



c. Fertile lemma 1-awned 58. Chloris. 



cc. Fertile lemma 3-awned 59. TTichloris. 



10. Bariey Tribe, or Hordeae. 



A. Spikelets solitary at each joint of the axis. 

 a. Glume 1, except in terminal spikelet; 



spikelets placed with 1 edge to the axis 60. Lolium. 



BE. Glumes 2; spikelets placed with side to the 

 axis, 

 c. Palea adherent to the grain; rachilla dis- 

 articulating, the florets separating . .61. AgropyroTi, 



cc. Palea free from the grain; rachilla not dis- 

 articulating. 

 D. Shape of glumes very narrow, l-nerved.62. Secale. 

 nn. Shape of glumes ovate, 3- to many- 

 nerved 63. Triticum. 



AA. Spikelets in clusters of 2 or 3 at each joint of 

 the axis. 

 B. Lateral pair of each cluster pediceled. usu- 

 ally aborted, appearing like a cluster of 



jjv^-ns 64. Hordcum. 



BB. Lateral spikelets sessile, usually but 2 



spikelets at a joint 65. Elymits. 



11. Bamboo Tribe, or Bambuseae. 



A, Stamens 3: fr. a true caryopsia. 

 B. Spikelets 2- to many-fld. 



c. Infl. fasciculate 6(*. Oxyterian- 



cc. Infl. racemose or paniculate, not leafy: [thera* 



sts. cylindrical : sheaths persistent 67. Aj^ndi- 



ccc. Infl. spicate, leafy: sts. flattened on one [Tiaria. 



side : sheaths early deciduous 68. Phyllo- 



[atachys. 



BB. Spikelets 1-fld 69. Chuaquea. 



A.\.. Stamens 6. 



B. Pericarp thin, adnate to the seed, the fr. 



a true caryopsis 70. Bambuaa. 



BB. Pericarp, crustaceous, separable from the 



seed, the fr. nut-like 71. Dendro- 



[calamus 



Othergenera mentioned ;irc: Cenchrus, Cephalostachyum.Cinna, 

 Dactyloctenium. Di-Mctianipsi-a. Diandrolyra Distichlis. Imperata, 

 Leptochloa, Melica, M.lmis, I'aspalum, Kottboellia and Trisetum. 



210. LYCOPODIACE^. 



One genus in cultivation 



Lycopodium. 



211. SELAGINELLACE.^. 



One genus only Selaginella. 



