RUBIACEJS. (MADDER FAMILY.) 173 



and botanist, who died early at the Cape of Good Hope. HOUSTONIA, 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. OLDENLANDIA, 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. glomerata, 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. (O. uniflora, L. Hedyotis glomerata, Ett.) Wet places, S. 

 New York to Virginia near the coast, and southward. 



$ 2. HOUSTONIA, L. Corolla salver-form or funnel-form, with the tube longer 

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

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

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

 lowed inner Jace. (Flowers of two forms, dioxiously dimorphous; p. 171, note.) 



* Corolla funnel-form, often hairy inside: stems erect: stem-leaves sessile: Jlowert 

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

 and Oldenlandia.) , 



2. O. purpitrca. Pubescent or smooth (8' -15' high); leaves varying 

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

 globular pod. 1|. (Houstonia purpurea, L. H. rarians, Michx.) Woodlands, 

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

 into: 



Var. lougifolia. 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. (Houstonia longifolia, Wittd.) Maine to Wisconsin and southward. 

 A narrow-leaved, slender form is H. tenuifolia, Nutt. 



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

 thickish and ciliate; calyx-lobes as long as the pod. (Houstonia ciliolata, 

 Ton.) Along the Great Lakes and rivers, from N. New York to Wisconsin. 



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

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

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

 pod obovoid and acute at the base, only its summit free from the calyx, opening first 

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

 tifolia, Michx. Hedyotis stenophylla, Tver, fr Gray.) Plains and banks, from 

 Illinois southward. June - Aug. 



* * Corolla salver-form, mostly blue : pod fiattish laterally and notched at the broad 



summit, or somewhat twin : plants commonly small and sknder. 



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

 high) ; peduncles not longer than the linear-spatulate leaves ; pod barely J free ; seeda 

 smoothish. (Houstonia minima, Beck.) River-banks, Illinois and 

 southward. March - May. 



15* 



