ENDOQENS. 27 



the fringes of the fls. Small marsh plants. 10 genera, over 220 

 species, in S. Am., N. Am., Australia, H". HoU., Asia, Gt. Brit. 



1. Eriocaulon, 100 species. 2. PsepaUnthus. 3. Lachnocaiilon. 

 These three in tJ. S., chiefly S. 



Ord. 5. Flagellari^cese. Whip-Grasses— Fls. g. Sepals 3; 

 petals 3, larger, colored, hut glumaceous. Infl. paniculate. Sta. 6, 

 free. Styles 3. Pr. a herry. Lvs. lanceolate, terminating in a whip- 

 like spiral tendril. Herbs, reedy or sarmentose. 2 genera : 1. Fla- 

 gellaria. 2. Joinvillea. Tropical Asia, Australia, New Caledonia. 



Spiderwort Alliance. — Bmb. extruded. Fls. g . Perianth of 6 

 segments, 2-seriate, inner segments petaloid, colored. Sta. 2-6, some 

 of them often abortive. Styles usually 3-fid. Fr. a caps. 6. Xyri- 

 dace8e. 7. Commelynaces. 



Ord. 6. Xyridaceae. Yel£ow-eyed Grasses. — Infl. a small spi- 

 cate hd. of imbricate 1-flowered searious bracts terminal on a tall scape. 

 Sta. 3, staminodes 3. Petals yellow. Lvs. radical. Sedge-lilie plants, 

 often in marshes. 2 genera. 1. Xyris, 50 species, usually tropical ; in 

 both hemispheres, but abundant in S. Am. Several species in U. S. 



2. Abblboda, 6 or 7 species, S. Am. 



Ord. 7. Commelynaceae. Spiderworts.^ — Emb. sunk in a pit of 

 the perisperm, but still extruded. Infl. with leafy bracts or spatha- 

 ceous involucre. Sta. 6, some of them abortive (or 3 in Mayaca). 

 Succulent Herbs, wfth simple sheathing lvs. ; ann. with fibrous rts., 

 perenn. with rhizome. 16 genera; 260 species. New Holl., E. and W. 

 Ind., Af., N. and S. Am. 1. Commelyna. Petals 3, blue or purple; 

 1 minute or 0. Numerous species, several in U. S., from S. New 

 York, S. and "W. 2. Tradesc&ntia, Spiderwort, Wandering Jew. 

 Fls. blue, purple, pink, white. Stems and hairs jointed. Lvs. some- 

 times variegated. Several species; 3 in U. S. ; N. Y., S. and W. 

 T. virginiea. Fls. blue ; cyclosis in hairs. Fig. 242. Allied genus 

 Mayaca (Syena). Emb. half immersed in perisperm, but still ex- 

 truded. Sta. 3, anthers 1-celled; fl. sol., white, pinlc, violet. Lvs. 

 linear, flaccid. Small moss-like marsh or aquatic Herbs. 3 or 4 spe- 

 cies. Va. to Brazil. M. Michauxii, only one in U. S. 



Pontederia Alliance. — Emb. included and immersed in perisperm. 

 Perianth of 6 segments, 2-seriate. Sta. 6-3. Style single. Fr. a 

 capsule or utricle. 8. Philydracese. 9. Pontederiaceae. 10. Rapa- 

 teacese. 



Ord. 8. Philydraceae. Watbbwoets. — Perianth of 2 yellow mar- 

 cescent segments. Sta. 3 ; 2 sterile, petaloid. Infl. spieate or 

 racemose. Fr. a caps. Lvs. ensiform. Marsh Herbs. 2 genera. 

 1. Philydrum, N. Holland, China. 2. Hetaeria, Australia. 



Ord. 9. Pontederiaceae. Piokkbel- Weeds. — Perianth 6-parted, 

 irreg., white, blue, or violet. Sta. 6-3. Infl. spieate or paniculate. 

 Caps, or Utricle enveloped in the peTsistent (fleshy) base of the peri- 

 anth. Lvs. oval, orbicular, cordate, sagittate, rarely linear. Aquatic 

 or marsh Herbs, with rhiz., or rooting stem. 6 gen. ; 30 spec. N. and 

 S. Am., E. Ind., Af. 1. Pontederia. Stem 1-leaved, with a spike 

 of blue fls. P. corddta, l°-2° high. If. large, cordate, sagittate. 

 Muddy shores. Can., U. S. P. lancifhUa, 2°-2J° high, lvs. lance.- 

 pblong or linear. Pools, Ga., S. C. 2. LeptSnthus (Sch611era) gra- 

 minea. Water Star. Lvs. linear, translucent. Submerged, except 

 the sol., yellow fls. Streams, U. S. 



