178 CONTRIBUTIONS FROM THE NATIONAL HERBAeiUM. 



PONTEDEKIACEAE. roNDWKKi) Family. 



HETERANTHERA. 



1. Heteranthera dubia (Jiu<i.) M.uM. Met. Minn. 13.S. 1892. 

 Commelina duoia thuq. Olxs. Bot. 3: 9. j)l. 59. 1768. 



SchoUera graminifolia Willd. Neuo. S<-hr. Ges. Naturf. Fr. 3: -138. 1801, noni. nud. 

 Heteranihfra graminea Valil, Eimin. 2: 4.5. 1806. 

 I^ptanihun gramim'us Miolix. Fl. 1: 25. 1803. 



Tyi'e ixxwlity: Tlie type .speciinon is Clayton's number 814, probably from Virginia. 

 Range: AVasliington to Ontario, soutli to Mexico and Florida. 

 Speclmens examined: Ilaiif^nian or Ljitah Creek near Marsliall Junction, Suksdorf. 



JUNCACEAE. Rush Family. 



Ijeiif sheatlis ojM'ii; capsule 1 or 3-ceIled, many-seeded; placentae pari- 

 etal or axial JuNCUS (p. 178). 



Leaf slieatl IS closed; capsule 1-C4*iled, .'J-seeded; placenta basal Juncoides (p. 184). 



JUNCUS. Rush. 



Lowest leaf of the inflorescence appearing like a continuation of 

 the stem, tlie inflorescence therefore .seemingly lateral. 

 Flowers in compound panicle-s, usually numerous. 



Stamens 3; leaf of the inflorescence much shorter than 

 the stem. 



Perianth green ; panicle loose I. J. eff^isus. 



Perianth brown ; panicle close la. J. effusus hesperitia. 



Stamens 6. / 



Perianth green; leaf of the inflorescence as long a.s 



the stem 2. J.Jiliformis. 



Perianth parts brown, a green stripe each side of the 

 midrib. 



Flowers 3 to 4.5 nrni. long 3. J. halticus. 



Flowers 5 to 6 mm. long A. J . lescurii. 



Flowers few, 1 to 3 in each cluster. 



Inner sheaths bnstlo-tipped; cap.sule retu.se 5. J. subtriflorus. 



Inner sheaths leaf-beanng; capsule acute 6. «/. parryi. 



Lowest leaf of the inflorescence not appearing like a continuation 

 of tlie stem. • 



Lt^aves not provided with cro.s.s-partitions, either flat and 

 grass-like or terete and channeled. 



Flowers bracteolate, loosely scattered or somewhat con- 

 gested but not in heads. 



Annuals; stems branched, leafy. 



Stamens G; flowers loosely scattered. 



Capsule oblong 7. J. bufoniits. 



Capsule globose 8. J. sphaerocarjxus. 



Stamens 3. 



Inflorescence l-flowered; bract 1 9. J. undalis. 



Inflorescence few-flowered; bracts 2 or 



more, style short 10. J. hrachystylua. 



Perennials; stems simple. 



Perianth segments 2.5 to 4 mm. long; capsule 



3-cclled, panicle close 11. J. confusus. 



