CL.V.] PENTANDHIA DIGYNIA. 141 



Mr. Dickson, Glen Isla, Clova. En?. Bot. vol. xiii. pi. 896. Eng. Fl. 

 vol. ii. p. 30. 408. 



4. G. Amartlla. Autumnal Gentian. Corolla salver-shaped, five- 

 cleft ; bearded at the mouth ; calyx with five equal segments. Stem 



from six inches to a foot high, square, erect, panicled, bearing numerous 

 purplish-blue flowers. Annual : flowers in August and September : 

 grows in pastures : common. Eng. Bot. vol. iv. pi. 236. Eng. Ft. 

 vol. ii. p. 30. 409. 



5. G. camptstris. Field Gentian. Corolla salver-shaped, four-cleft, 

 bearded at the mouth ; two outer segments of the calyx egg-shaped, 



very large. Stem from two to six inches high, with egg-shaped, acute 



leaves, and purplish-blue flowers. Annual : flowers in September and 

 October : grows in dry pastures : common in Scotland, especially the 

 Hebrides. Eng. Bot. vol. iv. pi. 237. Eng. Fl. vol. ii. p. 31. 410. 



49. ERY'NGIUM. ERYNGO. 



Flowers aggregate. Common receptacle conical, scaly, many- 

 flowered, each flower having an acute, simple, or three-cleft scale. 

 Calyx of each flower superior, of five, pointed, equal, erect leaves. 

 Petals five, equal, oblong, channelled, taper-pointed, inflected 

 about the middle. Filaments hair-like, straight, longer than the 

 corolla ; anthers roundish. Germen oblong, covered with erect 

 bristles. Styles thread-like, straight, nearly erect, shorter than the 

 stamens ; stigmas simple. Fruit egg-shaped, bristly, separable 

 into two parts. Seeds oblong, nearly cylindrical, coated. Name 

 eryngion of Dioscorides. 134. 



1. E. maritimum. Sea Eryngo. Root-leaves roundish, plaited, 

 thorny ; heads of flowers stalked ; scales of the receptacle three-cleft. 



Root long, cylindrical : stem a foot high, round, branched ; petals 



bright-blue. The roots are considered stimulating and restorative. Pe- 

 rennial : flowers in July and August : grows in sand on the sea-shore. 

 Eng. Bot. vol. x. pi. 718. Eng. Fl. vol. ii. p. 35. 411. 



2. E. camptstre. Field Eryngo. Root-leaves twice or thrice pinna- 



tifid ; scales of the receptacle undivided. More bushy and slender 



than the last : petals purplish. Perennial : flowers in July and August : 

 grows in waste ground, near the sea : very rare : naturalized near Ply- 

 mouth, and at Lismore, Waterford, Ireland. Eng. Bot. vol. i. pi. 57. 

 Eng. Fl. vol. ii. p. 35. 412. 



50. HYDROCO'TYLE. WHITE-ROT. 



Flowers all perfect and regular. Calyx none. Petals five, 

 equal, egg-shaped, undivided, spreading. Filaments awl-shaped, 

 spreading, shorter than the corolla ; anthers roundish. Germen 

 round, compressed, ribbed, smooth. Styles cylindrical, spreading, 

 tumid at the base, shorter than the stamens, permanent ; stigmas 

 simple. Fruit round, compressed, crowned with the permanent 

 styles. Seeds hemispherical, tumid, each with prominent angles. 

 Named from hydor, water, and cotyle, a cup. 135. 



1. H. vulguris. Marsh Penny. White-rot. Leaves round, shield- 

 shaped, smooth, cleft at the base ; umbels somewhat aggregate ; flowers 



N 



