Dioon merolae (Zamiaceae), a new species from Mexico

A new species ofDioon found in northwestern Chiapas is characterized by linear-lanceolate leaflets arising at an acute angle from the rachis, obliquely inserted on it and imbricate.     

Dioon holmgrenii (Zamiaceae), a new species from Mexico

A new species ofDioon (Dioon holmgrenii), found on the Pacific slope of southern Oa xaca, is characterized by leaflets which are spinulose especially on the upper margin, elongate and narrow. Distribution and ecology of OaxacanDioon species are reported.     

Dioon caputoi (Zamiaceae), a new species from Mexico

A new species ofDioon (D. caputoi), found in Puebla, Mexico, is characterized by narrow leaflets, arising at an acute angle from the rachis and regularly and widely spaced along it. This species has hitherto been confused withD. purpusii.     

Dioon rzedowskii (Zamiaceae), a new species from Mexico

A new species ofDioon has been found in Oaxaca. It is characterized by leaflets which are entire, lanceolate but unequally tapering toward the apex and over 10 mm wide at the middle portion of the frond.     

Hesperozygis pusilla (Labiatae), a new species from Mexico

Hesperozygis pusilla Irving, a rare and apparently endemic species from Galeana, Nuevo León, is described. It is closely allied toH. ciliolata Epling. BothH. ciliolata andH. pusilla have chromosome numbers of 2n = 36.     

Dioon califanoi (Zamiaceae), a new species from Mexico

A new Mexican species ofDioon has been found in Oaxaca,Dioon califanoi, characterized by keeled fronds and leaflets inserted obliquely above the rachis. A key to the known species ofDioon is given.     

Townsendia gypsophila (Compositae: Astereae): a new species from northern New Mexico

Townsendia gypsophila, a new species from Sandoval Co., New Mexico, is described and illustrated. It is a narrowly distributed obligate gypsophile closely related toT. fendleri andT. incana. It overlaps the ranges of the two taxa at the edge of their distributional limits in New Mexico.     

Symplocos pachycarpa (Symplocaceae), a new species from southern Mexico

Symplocos pachycarpa is described as new, and an illustration is provided. This species grows in cloud forests and oak-pine forests of Oaxaca and Guerrero, Mexico, and is most similar toS. citrea. A key is provided to distinguishS. pachycarpa from related Mexican species.     

Cheilanthes mickelii (Adiantaceae), a new species from southern Mexico

Cheilanthes mickelii from Oaxaca and Chiapas, Mexico is described, illustrated and compared with an apparent near relative,C. tryonii T. Reeves nom. nov.     

Salvia tonaticensis (Lamiaceae), a rare new species from Mexico

Salvia tonaticensis is described and illustrated as a new species to science. It is known from the extreme southern portion of the Estado de Mexico and northern Guerrero, Mexico. It belongs to section Polystachyae; however, unlike the species of the section hitherto known, it possesses simple, bifurcate and trifurcate multicellular hairs on the stems, abaxial leaf surface, petioles, and inflorescence rachis. The flowers are also larger than those of other species of the section, and the calyces are densely tomentose with purple or white multicellular hairs that vary from simple to dendriform. Within the section this species shows some morphological similarities to S. connivens.     

Justicia masiaca (Acanthaceae), a new species from northwestern Mexico

Justicia masiaca, a new species endemic to northwestern Mexico, is described, illustrated, and compared with the morphologically similarJ. longii. In its 4-aperturate pollen,Justicia masiaca is unique among those species ofJusticia with elongate, cylindrical corolla tubes that were previously treated inSiphonoglossa.     

Randia retroflexa (Rubiaceae), a new species from southern Mexico

A new species of Rubiaceae,Randia retroflexa, is described and illustrated from Veracruz, Oaxaca, and Chiapas in southern Mexico. An armed canopy vine of lowland and lower montane tropical evergreen forest, it is distinguished by its paired reflexed spines and hirsute pubescence. Its distribution, habitat, and specimen citations are given and affinities are discussed.     

Deprea nubicola (Solanaceae), a new species from northern Colombia

A new species,Deprea nubicola, is described. Although the corolla is similar in some aspects to that ofD. bitteriana, D. nubicola is distinguished by its diminutive leaves, a low density of hairs in the corolla annulus, glabrous filaments, and a distinctive long-pedicellate, subulate-lobed fruiting calyx.Deprea nubicola shares withD. ecuatoriana a fruiting calyx that tightly invests the berry. The distribution ofD. nubicola is limited to the Sierra Nevada de Santa Marta of northern Colombia. A key to the species ofDeprea is provided.     

Distichochlamys rubrostriata (Zingiberaceae), a new species from northern Vietnam

A third species of the until recently monotypic genusDistichochlamys (Zingiberaceae) is described from living and preserved material collected in northern Vietnam.Distichochlamys rubrostriata is distinguished from the original species,D. citrea, and the recently describedD. orlowii, on the basis of leaf, inflorescence bract, lateral staminode, and labellum characters.     

Nowickea (Phytolaccaceae), a new genus with two new species from Mexico

A new genus of Phytolaccaceae,Nowickea, includes two new species,N. xolocotzii andN. glabra, each known only from its type locality in the states of Jalisco and Morelos, Mexico, respectively.Nowickea exhibits close relationship withPhytolacca by a robust herbaceous growth habit, 7- to 10-carpellate ovary, carpels with terminal, basally connate styles, basal placentation, and fleshy fruits. It is distinguished by green, subequal, herbaceous, and often lanceolate tepals 3 to 12 mm long, ovary and fruit elevated on a well developed gynophore, obovoid or obpyriform fruits, and narrowly ellipsoid seeds.     

Begonia lyman-smithii (Begoniaceae), a new species from Oaxaca,Mexico

Begonia (sect.Gireoudia)lyman-smithii is described and illustrated, and its relationships are discussed.     

Trisetum curvisetum (Poaceae: Aveneae), a new species from Mexico

Trisetum curvisetum is a new species from high Sierra Madre Oriental in Nuevo León, Mexico. Its soft rather than liquid endosperm is new for the genus, and its lemma awn is thin and flexuous, easily distinguishable from that of other North AmericanTrisetum.     

Pavonia ecostata (Malvaceae), a new species from Jalisco,Mexico

A new species ofPavonia (P. ecostata) from the Sierra Cacoma is described and illustrated and compared to its closest allies,P. alia andP. pulidoae.