Systematics and Relationships of Fallugia (Rosoideae—Rosaceae)

The paper presents a systematic monograph of Fallugia (Rosoideae, Rosaceae) consisting of one variable species, Fallugia paradoxa. Morphological, cytological and molecular data clearly support its relationship with Geums.l. rather than Purshia-Cowani, with which it is often allied. The species was named twice independently in 1825 from the specimens and drawings, respectively, assembled by Sessé and Mociño for their proposed Flora Mexicana. The paper discusses the nomenclatural history, morphological variation, and the polygarno-dioecious mode of reproduction of the species. No infraspecific taxa are recognized

xChiranthofremontia, An Intergeneric Hybrid of Chiranthodendron Pentadactylon and Fremontodendron \u27Pacific Sunset\u27

x Chiranthofremontia lenzii, an intergeneric hybrid between Chiranthodendron pentadactylon and Fremontodendron \u27Pacific Sunset\u27 (Sterculiaceae: Fremontodendreae), was made artifically and is described as a hybrid genus. It shows distinctive intermediacy in floral (particularly androecial) characteristics between the parental taxa

New Species, Combinations, and Notes in Ipomopsis (Polemoniaceae)

Ipomopsis wendtii and Ipomopsis aggregata subsp. carmenensis are described as new from the Sierra del Jardín and Sierra del Carmen in northern Coahuila, Mexico, Ipomopsis pringlei is recognized as specifically distinct from Ipomopsis macombii. Gilia calothrysa is considered synonymous with I. macombii, and Ipomopsis effusa is reported as new to the floras of California and the United States

A Taxonomic Revision of Chilopsis (Bignoniaceae)

The genus Chilopsis contains one species, C. linearis, with two subspecies: subsp. linearis of the Chihuahuan Desert characterized by erect, straight leaves, and subsp. arcuata of the Sonoran and Mojave deserts with longer, arcuate leaves and other distinguishing characteristics. Populations of subsp. linearis east of the Sierra Madre Oriental in eastern Mexico have woolly stems and are described as a new variety, tomenticaulis. Relationships between Chilopsis and Catalpa are discussed and data are presented supporting continued recognition of Chilopsis as a distinct genus

Studies in Macrosiphonia (Apocynaceae): Generic Recognition of Telosiphonia

Woodson recognized two subgenera within Macrosiphonia (Apocynaceae: Apocynoideae), a South American subgenus Eumacrosiphonia, and a North American subgenus Telosiphonia each with five species. Both taxa are characterized by low subshrub-shrub, nonviny growth habits, white, long-tubed, vespertine corollas of a type associated with moth pollination. Their distinctive anther and style-tip characteristics show each is related to a group of genera around Mandevilla and Mesechites. The two subgenera, however, differ strongly from each other in inflorescence, style-head structure, and pollen size indicating that they are not sister taxa and that Macrosiphonia as currently recognized is polyphyletic. Thus the subgenus Telosiphonia is elevated to generic rank consisting of six species with one species and one variety described as new

New Species of Scutellaria (Lamiaceae) from the Chihuahuan Desert Region

Three new species of Scutellaria are described from the Chihuahuan Desert Region of Mexico: S. hintoniorum from western Nuevo León, S. wendtii from eastern Chihuahua, and S. carmenensis from northern Coahuila

A New Species of Leucospora (Scrophulariaceae) from the Chihuahuan Desert of Mexico

A new species, Leucospora coahuilensis, is described that is similar to Schistophragma intermedia in vegetative and floral characteristics, but has seed characteristics of Leucospora showing the value of combining the two genera under the latter genus