CLASS IV. ORDER I. 55 



HousTONiA LONGiFOLiA. WUld. LoHg Icavcd Houstonia. 

 Leaves lanceolate, narrowed at each end ; flowers 

 corymbed. WUld. 



Found in dry soils at Blue hills and elsewhere, not commonly 

 exceeding four or five inches in heiglit. Stem erect, six sided, 

 branching toward the top. Leaves smooth, opposite, lanceolate, 

 somewhat obtuse. Flowers purplish, in a terminal corymb. — 

 Calyx segments, oblong, acute; corolla funnel shaped, divided 

 into four acute spreading segments, pale striped with purple in- 

 side; stamens inserted in the tube ; style as long as the corolla, 

 stigma two cleft. — Blue hills, Milton. — June, July. — Perennial. 



62. AMMANNIA. 

 Ammannia humilis. Low Ammannia. 



Stem procumbent, leaves lanceolate narrowed to a 

 petiole, flowers solitary opposite sessile. 



Stem ascending, leaves oblong lanceolate, rather obtuse, acute 

 at base, and nearly sessile. Flowers small, red, closely sessile 

 in the axils. In wet meadows and on the muddy banks of 

 rivers. — August, September. — Perennial. 



63. GALIUM. 

 Galium asprellum. Mich. Pointed Cleavers or Clivers. 

 Stem decumbent, rough backward: leaves in sixes, 

 oval-lanceolate with a flaccid point ; flowers on very 

 short pedicels ; fruit smooth. Mich. abr. 



Found in thickets and low grounds. Stem weak, supported 

 by plants around it, like many others of the genus; rough with 

 minute refiexed prickles, as are also the ribs and margins of the 

 leaves. Leaves in whorls of six, lanceolate, with a slender, sca- 

 rious, curved point. Flowers white. Fruit smooth, very mi- 

 nute. — June, July. — Perennial. 



Galium septentrionale. jR. Sf S. Northern Galium. 

 Stem erect, smooth ; leaves in fours linear-lanceo- 

 late, acute, with the margin and midrib rough ; pani- 

 cle terminal ; fruit hispid. 



