174 PRACTICAL BOTANY. 



373. A little tooth between each of the 5 or G linear- 

 lanceolate segments of the corolla. Pod few-seeded. Fila- 

 ments exserted, distinct. Leaves lanceolate, dotted with 

 purple glands. Flowers yellow, small, in axilhxry, peduncled 

 spikes or racemes. Marsh herbs. 



(143) Naiimburgia thyrsiflora, Reichenb. 

 Teeth none in the sinuses of the corolla-limb. Pod 

 few- to many-seeded, 5- to 10-valved. Filaments often united 

 in a ring, mostly with the rudiments of a sterile set between 

 the fertile filaments, at the base. Leaves opposite, or in 

 whorls of 4, 5 (rarely 3 or 6), with or without dots. Flowers 

 axillary, or racemed, mostly yellow. Ijysiinachia. 



374. Style distinct and slender, deciduous. Anthers 

 erect, curved or spiral. Flowers rose-color or pink 375 



Style, if any, and stigmas persistent. Anthers 

 straight. Flowers blue, purple, yellowish, or greenish-white. 



376 



375. Corolla wheel-shaped, 5- to 12-parted. Stamens 5- 

 12. Anthers soon recurved. Style 2-parted. Sabbatia. 



Corolla funnel-form or salver-shaped, 5- (or 4-) lobed, 

 twisted and withering on the pod. Anthers spiral. Style 

 not parted ; stigma capitate or bilabiate. 



(349) Erythraea. 

 370. Corolla with a small spur at the base of each lobe. 

 (351) Halenia deflexa, Griseb. 



Corolla without spurs, mostly with plaited folds at 

 the sinuses of its border. (353) Gentiana. 



377. (355.) Corolla-limb somewhat unequally and ob- 

 liquely 5-lobed; lobes rounded ; tube bell-shaped ; throat ex- 

 panded, open and naked. Stamens mostly exserted. Style 

 filiform. Nutlets rough or wrinkled. Leaves lanceolate, 

 sessile. Flowers reddish-purple, or blue, in spikes or pani- 

 cled racemes. Echium vulgare, L. 



Corolla-limb equally 5-lobed 378 



378. Nutlets prickly. Style lateral. Corolla-throat 

 closed by very conspicuous scales • 379 



Nutlets not prickly, fixed by their base, separate 

 from the style. Coarse herbs. Corolla-throat closed by 

 convex scales or folds, or rarely naked 380 



