178 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
PONTEDERIACEAE. Ponpweep Famitry. 
HETERANTHERA. 
1. Heteranthera dubia (Jacq.) MacM. Met. Minn. 138. 1892. 
Commelina dubia Jacq. Obs. Bot. 3: 9. pl. 59. 1768. 
Schollera graminifolia Willd. Neue. Schr. Ges. Naturf. Fr. 3: 438. 1801, nom. nud. 
Heteranthera graminea Vahl, Enum. 2: 45. 1806. 
Leptanthus gramineus Michx. Fl. 1: 25. 1803. 
TyPr Locauity: The type specimen is Clayton’s number &14, probably from Virginia. 
Rance: Washington to Ontario, south to Mexico and Florida. 
SPECIMENS EXAMINED: Hangman or Latah Creek near Marshall Junction, Suksdorf. 
JUNCACEAE. Rusu Faminy. 
Leaf sheaths open; capsule 1 or 3-celled, many-seeded; placentae pari- 
etal or axial ... 2222222 ee eee eee eee Juncus (p. 178). 
Leaf sheaths closed; capsule 1-celled, 3-seeded; placenta basal... ... JUNCOIDES (p. 184). 
JUNCUS. Rusu. 
Lowest leaf of the inflorescence appearing like a continuation of 
the stem, the inflorescence therefore seemingly lateral. 
Flowers in compound panicles, usually numerous. 
Stamens 3; leaf of the inflorescence much shorter than 
the stem. 
Perianth green; panicle loose...........--.--.--- 1. J. effusus. 
Perianth brown; panicle close. ...........-.----- la. J. effusus hesperius. 
Stamens 6. 
Perianth green; leaf of the inflorescence as long as 
the stem..........--.-------------+---------- 2. J. filiformis. 
Perianth parts brown, a green stripe each side of the 
midrib. 
Flowers 3 to 4.5 mm. long................--- 3. J. balticus. 
Flowers 5 to 6 mm. long.............-.-.-.- 4. J. leseurii. 
Flowers few, 1 to 3 in each cluster. 
Inner sheaths bristle-tipped; capsule retuse.....-.-.-- - 5. J. subtriflorus. 
Inner sheaths leaf-bearing; capsule acute......... 6. J. parryi. 
Lowest leaf of the inflorescence not appearing like a continu ation 
of the stem, 
Leaves not provided with cross-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 6; flowers loosely scattered. 
Capsule oblong.........-........-----.. 7. J. bufonius. 
Capsule globose.......-..-.------------- 8. J. sphaerocar pus. 
Stamens 3. 
Inflorescence 1-flowered; bract 1_.....-. - 9. J. uncialis. 
Inflorescence few-flowered; bracts 2 or 
more, style short... ......2.2...-.-.- 10. J. brachystyius. 
Perennials; stems simple. 
Perianth segments 2.5 to 4 mm. long; capsule 
3-celled; panicle close.........-.---------- 11. J. confusus. 
