1056 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



Shrub ; leaves oblong or oblong-ovate, 2 to 6 cm. long, acuminate, serrulate 

 or subentire, pilose ; flowers solitary or cymose ; calyx long-pilose ; petals 

 purplish, 1 cm. long. 



10. MONOCHAETUM Xaud. Ann. Sei. Nat. III. 4: 4S. 1845. 

 Shrubs, variously pubescent ; leaves entire, 3 to 7-nerved ; flowers usuallji 

 terminal, cymose or solitary, few, pink, purple, or violet, 4-parted ; calyx 

 hairy the lobes ovate or lanceolate, equaling or shorter than the tube ; petals 

 obovate; stamens unequal, the anthers elongate-linear or subulate, the larger 

 ones with a porrect, usually elongate appendage at base, the connective not 

 produced at base; capsule 4-celled; seeds curved or coiled. 



Hairs of the stems finely plumose and spreading 1. M. pulchrum. 



Hairs not plumose or, if so, appressed. 



Pubescence of the young stems appressed, or the stems glabrous. 



Stems glabrous except at the nodes 2. M. pringlei 



Stems with appressed hairs. 



Leaves oblong-linear 3. M. angustifolium. 



Leaves lanceolate or ovate. 

 Leaves short-petiolate, appressed-setose on the upper surface; calyx 



lobes shorter than the tube 4. M. deppeanum. 



Leaves long-petiolate, mostly glabrous on the upper surface; calyx 



lobes equaling or longer than the tube 5. M. alpestre.. 



Pubescence of the young stems spreading. 



Pubescence of stems of gland-tipped hairs 6. M. bracteolatuin. 



Pubescence of stems eglandular. 



Lobes of the calyx longer than the tube 7. M. candoUei. 



Lobes equaling or shorter than the tube. 



Calyx with gland-tipped hairs 8. M. floribundum. 



Calyx with glandless hairs 9. M. calcaratum. 



1. Monochaetum pulchrum Decaisue, Rev. Hort. III. 2: 101. /. 6. 1848. 

 Monochaetum plumosum Naud. Ann. Sci. Nat. III. 14: 160. 1850. 

 Monochaetum pulchellum Naud Ann. Sci. Nat. III. 14: IGl. 1850. 

 Veracruz and Oaxaca. 



Branches stout, densely plumose-hirsute with brownish hairs ; leaves short- 

 petiolate, oblong or ovate, 3 to 6 cm. long, 5 or 7-nerved, acute, densely 

 covered with stellate and with appressed plumose hairs; calyx lobes shorter 

 than the tube ; petals 1 cm. long. 



2. Monochaetum pringlei Rose, Contr. U. S. Nat. Herb. 8: 327. pi. 72. 1905. 

 Morelos; type from Cuei-navaca. 



Shrub, a meter high or less, the branches setose only at the nodes; leaves 

 linear-lanceolate, 2 to 4 cm. long, 3 to 6 mm. wide, attenuate, 3-nerved, ciliate, 

 glabrous above, sparsely appressed-setose beneath along the nerves; flowers 

 terminal, solitary ; calyx appressed-setose with eglandular hairs ; petals 

 purplish, about 1.5 cm. long. 



3. Monochaetum angustifolium Cogn. in DC. Monogr. Phan. 7: 1181. 1891. 

 Type collected between Piletas and San Miguel, near Jalapa, Veracruz, alti- 

 tude 1,800 to 1,900 meters. 



Branches slender, setose at the nodes, elsewhere appressed-setulose ; leaves 

 2 to 3.5 mm. wide, appressed-setulose beneath along the nerves, 3-nerved; 



