NOTES ON THE GENUS MATELEA (APOCYNACEAE S.L.) Warren Douglas Stevens Michigan State University, East Lansing, Michigan A8824 While preparing a revision of Matelea subgenus DiotyanthuSj I included in my studies three species which I now exclude from this subgenus. It seems more appropriate to publish the treatments of these three species here than as part of the revision of the sub-genus. One of the species is described as new and one is provided with a new combination. Notes concerning two species of Matelea more distantly related to subgenus Dictyanthus are also provided. In referring to the descriptions given here, it will be help-ful to make note of certain usages of terminology. (1) The description of the indumentum has been simplified and, to a certain extent, generalized by the convention of referring to all trichomes as either shorty glandular, or lor^ and modifying these terms as appropriate. These trichomes are all uniseriate and multicellular and can have straight or uncinate tips. Short trichomes are less than 0.1 mm long, typically about 0.05 mm. Glandular trichomes are the same length to slightly shorter than the short trichomes and have a short stalk, an inflated middle, and a short apiculum. The inflated part typically collapses on drying, giving these the appearance of capitate glandular trichomes. Long trichomes are more than 0.1 mm long, typically much more. (2) The leaves are described essentially according to Hickey (1973). This terminology is likewise employed to describe the shape of the bracts, calyx lobes, and corolla lobe apices. The leaf length has been considered to be the length of the midrib and the leaves are described on the basis of the largest leaf of each specimen examined. (3) I have considered the corolla lobes to be distinct from the limb. The corolla, then, is composed of the tube, the limb, and the lobes. (4) Measurements of the pollinia are taken in the normal orientation they assume when removed. The length of the pollen sac is taken from the point of attachment of the corpusculum to the tip, including, therefore, the translator arm or caudicle. MATELEA SEPICOLA W. D. Stevens, sp. nov. Type: Stevens 1436 (MSC, holotype) . Matelea sepicola W. D. Stevens; species insignis corolla parva urceolata (2.5-4.5 mm e basi ad sinum) habenti paginam interiorem glabram et lineas parallelas verticales intra tubum et lobis coronarum crasse laminaribus rhombeis (in aspectu 387
BioStor
