1050 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



Plants herbaceous, usually much branched, the stems glandular-pilose ; leaves 

 petiolate, broadly ovate to ovate-lanceolate, obtuse or acute, 1 to 1.5 cm. 

 long, serrulate ; flowers solitary ; calyx tube 3 mm. long ; petals pink or purple, 

 6 mm. long. 



.5. HETEROCENTRON Hook. & Arn. Bot. Beechey Voy. 290. 1840. 



Plants herbaceous or suffrutescent ; leaves 3-nerved or pinnate-nerved ; flow- 

 ers solitary or paniculate, 4-parted ; calyx tube ovoid or hemispheric, the 

 lobes triangular, acute, about as long as the tube ; petals ovate or obovate ; 

 stamens very unequal, the connective of the larger anther long-produced be- 

 low the cells and appendaged ; capsule 4-valvate. 



The following species are all that are known. 



Flowers solitary. 



Calyx glandular-setose; leaves 3-nerved 1. H. elegans. 



Calyx setulose with glandular hairs; leaves pinnate-nerved. 



2. H. suffruticosum. 

 Flowers paniculate. 

 Pedicels glabrous. 



Pedicels in anthesis little if at all exceeding the calyx tube ; calyx lobes 



lance-triangular 3. H. subtriplinervium. 



Pedicels in anthesis more than twice as long as the calyx tube ; calyx 



lobes linear 4. H. laxiflorum. 



Pedicels setulose. 

 Calyx tube glandular-setulose. 



Calyx lobes not ciliate 5. H. axillare. 



Calyx lobes usually conspicuously ciliate 6. H. mexicanum. 



Calyx tube without gland-tipped hairs. 

 Scales at apex of the ovary not ciliate. 



Calyx tube 3 mm. long; leaves 1 to 2.5 cm. wide 7. H. roseum. 



Calyx tube 4 to 5 mm. long ; leaves 2.5 to 3 cm. wide-8. H. occidentale. 

 Scales setose-ciliate. 



Branches conspicuously winged 9. H. alatum. 



Branches not winged 10. H. macrostachyTim. 



1. Heterocentron elegans (Schlecht.) Kuntze, Rev. Gen. PI. 1: 247. 1891. 

 Heeria elegans Schlecht. Linnaea 13: 432. 1839. 



Heeria procumbens Naud. Ann. Sci. Nat. III. 14: 151. 1850. 



Schizocentron elegans Meisn. Gen. Comm. 355. 1843. 



Veracruz ; type from Jalapa. 



Stems prostrate, herbaceous or sufi!rutescent, appressed-setulose ; leaves 

 broadly ovate, 5 to 12 mm. long, obtuse or acute, crenulate, ciliate ; flowers long- 

 pedicellate; calyx tube densely glandular-setulose, the hairs with enlarged 

 bases ; petals 10 to 12 mm. long, bright crimson ; scales at apex of ovary ciliate. 



This plant has been cultivated in the United States under the names " crim- 

 son creeper," and Heeria mexicana. 



2. Heterocentron sufEruticosum T. S. Brandeg. Univ. Calif. Publ. Bot. 6: 57. 



1914. 



Type from Cerro del Boquer6n, Chiapas. 



Stems decumbent, suffrutescent, appressed-setulose, the roots tuberiferous ; 

 leaves broadly ovate or rounded. 3 to 5.5 cm. long, rounded or very obtuse at 

 apex, entire, sparsely appressed-setulose; flowers long-pedicellate; petals pink 

 or purple, 14 mm. long. 



