ACANTHACEiE. 159 



2. Pliry'ina. Flowers In loose slender spikes, re/iea;e(J in /r«!i. Calyx 

 cylindrical, 2-lippEd, the upper Up of three slender teeth. 

 Corolla 2-lipped. Ovary 1-celled and 1-seeded. 



1. TEKBE'NA, L. Vbkvaik. 



1. V. hasta'ta, L. (Blue Vbbvaik.) Stem 3-5 feet high. 

 Leaves oblong-lanceolate, taper-pointed, serrate. Spikes of 

 purple flowers dense, erect, corymbed, or panicled. — Low 

 meadows and fields. 



2. V. urtieifo'lla, L. (NEirtE-LEAVBD V.) Stem tall. 

 Leaves oblong-ovate, acute, coarsely serrate. Spikes of 

 small white flowers very slender, loosely panicled. — Kelds 

 and roadsides. 



3 V. angUStifo'lia, Michx. Stem low. Leaves narrowly 

 lanceolate, tapering at the base, sessile, roughish, slightly 

 toothed. Flowers purple, in a crowded spike. — Dry soil. 



4. V. bracteo'sa, Michx. Stem spreading or procum- 

 bent, hairy. Leaves wedge-lanceolate, cut-pinnatifid or 8- 

 cleft. Spikes single, thick, sessile, leafy-bracted, the bracts 

 longer than the small purple flowers. — S. W. Ontario. 



2. PHKT'MA, L. LOPSEED. 



P. LeptOStaeh'ya, L. Corolla purplish or pale rose- 

 coloured. Stem slender and branching, 1-2 feet high. 

 Leaves ovate, coarsely-toothed. — "Woods and thickets. 



Order LXIL ACANTHA'CE^. (Acanthus Famtt.y.) 



Herbs (with us), with opposite leaves, diandrous (or didy- 

 namousj stamens inserted on the tube of the 2-Iipped corolla, 

 and a 2-celled and several-seeded capsule. Seeds flat, sup- 

 ported by hooked projections of the placentas. Flowers 

 commonly much bracted. Caljrx 5-oleft. Represented with 

 us by the single genus 



DIANTHE'RA, Gronov. Watek-Willow. 



D. Ameriea'na, L. A perennial herb growing in water 

 or wet places, with entire leaves and purplish flowers in 

 oblong, dense, long-peduncled, axillary spikes. Corolla 



