1194 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



sessile; calyx 5-parted, the lobes ovate-lanceolate, 4 mm. long; corolla rotate, 

 brown-purple or green, 10 to 12 mm. long, the lobes lance-oblong, pilose outside, 

 lanate in the throat; corona tubular, with 5 internal hornlike processes and 

 with 5 alternating external lobes, these each produced externally into 2 filiform 

 flexuous appendages; stigma depressed. 



DOUBTFUL GENERA, 



Iemischia flobibunda Schlecht. Linnaea 19: 739. 1845. Type from tropical 

 Mexico. 



MicBOSTELMA Baill. Hist. PI. 10: 286. 1891. The genus is said to consist 

 of two Mexican species, neither of which is given a name. 



Pachystelma cobdatum T. S. Brandeg. Univ. Calif. Publ. Bot. 7: 330. 1920. 

 Type from Acasonica, "Veracruz. 



Stelmagonum hahnianum Baill. Hist. PI. 10: 287. 1891. Type from Mexico. 



Tbichostelma crLiATUM Baill. Hist. PI. 10: 2SS. 1891. Type from Mexico. 



142. OONVOLVULACEAE. Morning-glory Family. 



Plants erect or scandent, woody or herbaceous ; leaves alternate, simple or 

 digitately compound, often lobate, estipulate ; flowers regular, perfect, usually 

 large and showy, commonly cymose; calyx inferior, 5-parted, the sepals free 

 or nearly so, strongly imbricate ; corolla gamopetalous, f unnelform, salver- 

 form, or carapanulate, the limb 5-lobate, commonly induplicate-valvate ; stamens 

 5, inserted on the corolla tube; style simple or bifid, the stigma or stigmas 

 capitate or bifid ; fruit capsular, 2 to 5-celIed, the cells 1 or 2-seeded. 



Several genera of the family are represented in Mexico only by herbaceous 

 species. 



Style bifid 1. BREWEBIA. 



Style simple below the stigma. 



Sepals small at first, in age accrescent and leaflike 2. PORANA. 



Sepals not accrescent or, if so, not becoming leaflike. 



Stigma with 2 elongate lobes 3. JACQUEMONTIA. 



Stigma entire or with 2 subglobose lobes. 



Anthers spirally twisted 4. OPERCULINA. 



Anthers not twisted. 



Stamens more or less exserted. 

 Corolla salverform, with broad limb, white or purple. 



5. CALONYCTION. 

 Corolla tubulax', with very narrow limb, usually red or yellow. 



6. EXOGONIUM. 

 Stamens Included. 



Capsule dehiscent, usually with 2 or more seeds 7. IPOMOEA. 



Capsule indehiscent, 1-seeded 8. TURBINA. 



1. BREWERIA R. Br. Prodr. Fl. Nov. Holl. 487. 1810. 



Shrubs or herbs, scandent or erect ; leaves entire ; cymes axillary or terminal, 

 or the flowers solitary; sepals subequal or the outer larger; corolla campanu- 

 late, the limb plicate, 5-angulate ; ovary 2-celled, 4-ovulate ; style bifid or the 

 stigmas 2 and distinct. 



Flowers in cymes 1. B. sulphurea. 



Flowers solitary. 



Leaves linear-lanceolate; stems erect 2. B. multicaulis. 



Leaves ovate or oval; stems prostrate 3. B. ovalifolia. 



