408 RUB1ACEAE. 



Stamens exserted, filaments distinct. 11. rhiaJanthus. 



Stamens included, filaments monadelphous at base. 

 Calyx-tube ovoid, limb 5-dentate ; corolla-lobes 



valvate. 12. Chiococca. 



Calyx-tube oblong, limb 4-partite; corolla-lobes 



imbricated. 13. Scolosanthus. 



Ovule not pendulous. 



Corolla-lobes imbricated. 14. Stnunpfla. 



Corolla-lobes valvate. 



Ovule or seed with a basa! attachment. 15. Psychotria. 



Ovule or seed with a lateral attachment. 



Shrubs or trees ; fruit a syncarp. 16. Alorinda. 



Herbs or low shrubs ; fruit not syncarpous. 



Stipules relatively small or inconspicuous, more 

 or less cleft. 

 Fruit drupaceous, carpels neither dehiscent 



nor separating. 17. Ernodea. 



Fruit not drupaceous, carpels dehiscent or 

 separating. 

 Fruit septicidal, both carpels ventrally 



dehiscent. 18. Borreria. 



Fruit separating into carpels, one dehis- 

 cent the other indehiscent. 19. Spermacoce. 

 Stipules foliaceous, usually resembling the 



leaves. 20. Galium. 



1. OLDENLANDIA L. Sp. PI. 119. 1753. 



Herbs, with opposite leaves, and small white or pink flowers. Calyx-tube 

 obovoid or subglobose, the limb 4 5-toothed. Corolla rotate or salverform, 

 4-5-lobed. Stamens 4 or 5, inserted on the throat of the corolla; anthers 

 oblong. Ovary 2-celled; ovules numerous in each cavity; style slender, 2-lobed. 

 Capsule small, ovoid, top-shaped or hemispheric, wholly adnate to the calyx- 

 tube, loculieidally dehiscent at the summit. Seeds angular, not peltate; endo- 

 sperm fleshy; embryo club-shaped. [Named for H. B. Oldenland, a Danish 

 botanist.] About 175 species, mostly of tropical distribution. Type species: 

 Oldenlandia corymbosa L. 



1. Oldenlandia callitrichioides Griseb. Mem. Am. Acad. II. 8: 506. 1862. 



Stems filiform, creeping, glabrous, 2-10 cm. long, rooting at the nodes. 

 Leaves ovate-orbicular, very thin, petioled, the blades 1-4 mm. long, glabrous 

 or with a few long hairs, obtuse or acutish at the apex, contracted into slender 

 petioles of about the same length ; stipules minute or obsolete ; peduncles soli- 

 tary in the axils, filiform, 2-3 times as long as the leaves ; calyx 4 5-toothed, 

 the teeth ovate to lanceolate, bearing a few long hairs, much shorter than 

 the tube; corolla white, funnelform, 1.5-2 mm. long, the 4 or 5 lobes shorter 

 than the tube; capsule turbinate, about 2 mm. long. 



Moist ground, Rum Cay : Cuba ; Guadeloupe. Recorded from St. Croix. Small 

 Oldenlandia. 



2. RACHICALLIS DC. Prodr. 4: 433. 1830. 



A low, white-wooly, densely and intricately branched shrub, with small 

 opposite fleshy linear imbricated leaves, persistent connate stipules, and 

 small opposite sessile solitary flowers half-inclosed by the stipular sheaths. 

 Calyx-tube very short, its 4 lanceolate teeth with smaller accessary ones 

 between them. Corolla salverform, with 4 oblong imbricated lobes. Stamens 

 4; filaments short. Ovary 2-celled, half -superior ; styles thick, slightly 2-lobed; 

 ovules numerous in each cavity. Fruit capsular; seeds angled. [Greek, 

 beauty of rocky shores.] A monotypic genus. 



