RUBIACE^E. (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 Junnd-form), shorter or 

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

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

 lateral or terminal.) 



\. 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. (0. uniflora, L. Hedyotis glomerata, Ell.) Wet places, S. 

 New York to Virginia near the coast, and southward. 



| 2. HOUST6NIA, 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-sJiaped, with a ridge doicn the middle of the hol- 

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



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

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

 and Oldenlandia.) 



2. O. pur pur ca. 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. 1J. (Houstonia purpurea, L. H. varians, Michx.} Woodlands, 

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

 into : 



Var. loiigifolia. 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, Willd.) Maine to Wisconsin and southward. 

 A narrow-leaved, slender form is II. tenuifolia, NiUt. 



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

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

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



3. O. an gpus ti foil a, Gray. Stems tufted from a hard or woody roct 

 (6' -20' high) ; leaves narroidy 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. 1J. ( Houstonia angus- 

 tifolia, Michx. Hedyotis stenophylla, Torr. $ Gray.) Plains and banks, from 

 Illinois southward. June -Aug. 



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



summit, or somewhat titin : plants commonly small and slender. 



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

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

 imoothish. (Houstonia minima, Beck.) Dry hills, &c. Illinois and 

 southward. March -Mav, 



