BLACKSTONIA. — ERYTHE.EA. 
265 
3. CiCENDiA. Cal. 4-partite ov lobed. Cor. salver-shaped, 
limb short, 4-fid. Stam. 4. Anth. erect, not twisted. 
Stigma capitate, undivided. Caps. 1- or imperfectly 2- 
celled. 
** Style persistent or stigma sessile. 
Tr. III. S WERTIEjE. Style often wanting, stigma persistent. 
4. Gentiana. Cal. 4 — 5-cleft. Cor. funnel- or salver-shaped, 
limb 4 — 5-cleft. Stam. 4 — 5, straight. Stigmas 2. Caps. 
1-celled, seeds on the infiexed margins of the valves. 
Subord. II. MENYANTHE^. Corolla induplicate in the 
bud. L. alternate, or opposite to the fl. -stems. 
5. Limnanthemum. Cal. 5-parted. Cor. rotate, thin ; limb 
5-parted, smooth on the disk, hairy or scaly at the base 
within. Stam. 5. Stigma with two toothed lobes. Caps. 
1-celled, not bursting. — L. simple, floating. 
6. Menyanthes. Cal. 5-parted. Cor. f unnelshaped, fleshy ; 
limb 5-parted hairy within. Stam. 5. Stigma capitate, 
notched. Caps. 1-celled, 2-valved ; valves bearing the 
seeds along their middle. — L. ternate. 
Suborder I. Genticaiece. Tribe I. Blackstonieoi. 
1. Blackstonia H^ids. [Chlora ed. viii.]. 
Yellow wort. 
1. B.perfolidta (Huds.) ; lowermostl. elliptic-oblong narrowed 
below, stem.-l. broadly connate. — E. B. 60. R. xvii. 1060. — 
St. 12 — 18 in. high, simple perfoliate. Stem.-l. triangular- 
ovate, connected by their whole breadth in rather distant pairs, 
glaucous. Panicle forked, many-flowered. Cal. divided to 
its base into linear-subulate segments. Cor. bright yellow. 
Stigmas yellow. — Damp chalky places. A. VII. — IX. E. I. 
Tribe II. Erythrceeoi. 
2. Eeythk^'a Necker. Centaury. 
* Stamens from top of cor. •tube. Caps, included. 
1. E. pulchel'la (Fr.) ; st. much branched acutely quad- 
rangular, 1. ovate the uppermost oblong lanceolate, ft. all 
stalked axillary and terminal, cal. rather shorter than the tube of 
