BVBIACEjE. (MADDER FAMILY.) 173 



and botanist, who died early at the Cape of Good Hope. Hocstoxia, made 

 a section of this genus, was much later dedicated to Dr. Houston, an English 

 botanist of the days of Linnaeus who collected in Central America.) 



\ 1. OLDEXLAXDIA, L. Corolla wheel-shaped (or funnel-form), shorter or 

 scarcely longer than the calyx-lobes : anthers short: pod wholly enclosed in and co- 

 herent with the calyx-tube: seeds very numerous, minute and angular. (Flowers 

 lateral or terminal.) 



1. O. glomcruta, Michx. Pubescent or smoothish ; stems branched 

 and spreading (2'- 12' high); leaves oblong (£'-§' long); flowers in sessile 

 clusters in the axils; corolla nearly wheel-shaped (white), much shorter than 

 the calyx. (Jj) (0. uniflora, L. Hedyotis glomcrata, A'//.) — Wet places, S. 

 New York to Virginia near the coast, and southward. 



\ 2. HOUSTOXIA, L. Corolla salver-form or funnel-form, with the tulie longer 

 than tlie calyx-lobes : anthers linear : ujiper half or the summit of the pod free and 

 projecting beyond the tube of the calyx : the teeth of the htttir distant: seeds rather 

 few (4-20) in each cell, saucer-shaped, with a ridge down the middle of the hol- 

 lowed inner face. (Flowers of two forms, diaxiously dimorphous; p. 171, note.) 



* Corolla funnel-form, often hairy inside: stems erect: stem-leavet sessile: flowers 

 mostly in terminal small cymes or loose clusters, purplish. (Connects lluustonia 

 and Oldenlandia.) 



2. O. purpurea. Pubescent or smooth (8'-l.V high); leaves varying' 

 from roundish-ovate to lanceolate, 3-5-ribbcd ; calyx-lobes longer than the half free 

 globular pod. lj. (Iloustonia purpurea,//. BL varians, Micluc.) — Woodlands, 

 W. Penn. to Illinois and southward. May -July. — Varying wonderfully, 

 into : — 



Var. longifolia. Leaves varying from oblong-lanceolate to linear, nar- 

 rowed at the base, 1-ribbed ; calyx-lobes scarcely as long as the pod : stems 5'- 

 12' high. (Iloustonia longifblia, Willd.) — Maine to Wisconsin and southward. 

 — A narrow-leaved, Blender form is II. tenuifolia, Null. 



Var. ciliolata. More tufted stems 3'- 6' high; root-kaves in rosettes, 

 thickish and ciliato; calyx-lobes as long as the pod. (Iloustonia ciliolata, 

 Torr.) — Along the Great Lakes and rivers, from N. Now York to Wisconsin. 



3. O. august ifolia, Gray. Stems tufted from a hard or woody root 

 (6'-20' high) ; leans narrowly linear, acute, 1-ribbed, many of them fascicled; 

 flowers crowded, short-pedicelled ; lobes of the corolla densely bearded inside; 



pod obovoid and ewute at the Ixise, only its summit free from the calyx, opening first 

 across the top, at length splitting through the partition, y. (Iloustonia angus- 

 tifolia, Michx. Hedyotis stenophylla, Zbrr. .j- Gray.) — Plains and banks, from 

 Illinois southward. June - Aug. 



* # Corolla salver-form, mostly blue : pod flatfish laterally ami notched at the broad 



summit, or somewhat twin : plajtts commonly srnall and slender. 



4. O. minima. Scabrous, at length branched and spreading (£'-3' 

 high) ; peduncles not longer than the linear-sjxitulale leaves ; pod barely J free ; seeds 

 smoothish. ® (D (Iloustonia minima, Beck.) — Dry hills, <fcc. Illinois and 

 southward . March - May. 



15* 



