600 CONTRIBUTIONS FEOM THE NATIONAL HEEBAEIUM. 



KEY TO THE SPECIES. 



Corolla 20 to 25 mm. long; anthers woolly 1. M. multijlora. 



Corolla 15 to 18 mm. long; anthers glabrous (before dehiscence).. 2. M. ludovidana. 



1. Myzon-hiza multiflora (Nutt.) Rydb. Bull. Torrey Club 33: 151. 1906. 

 Orobanche vndtiflora Nutt. Journ. Acad. Phila. II. 1: 179. 1848. 

 A'phyllvn multijloruni A. Gray in Brewer & Wats. Bot. Calif. 1: 585. 1876. 



Type locality: Sandy ground along the borders of the Rio del Norte, New Mexico. 

 Type collected by Gambel. 



Range: Utah and Colorado to California and Texas. 



New Mexico: Upper Pecos; Zuni; Socorro; San Marcial; Mesilla Valley; Gihnorea 

 Ranch; East View; Organ Mountains. Parasitic on the roots of various plants. 



2. Myzorrhizaludoviciana(Nutt.)Rydb.iuSmall,Fl. Southeast. U.S. 1093. 1903. 

 Orobanche ludoviciana Nutt. Gen. PI. 2: 58. 1818. 



Aphyllon ludovicianum A. Gray in Brewer & Wats. Bot. Calif. 1: 585. 1876. 

 ? Orobanche xanthochroa Nels. & Cockerell, Bot. Gaz. 37: 278. 1904. 

 Type locality: "In sandy alluvial soils, around FortMandan," North Dakota. 

 Range: Washington and Illinois to California and Texas. 



New Mexico: Zuni; Albuquerque; Carrizo Mountains; Cedar Hill; Organ Moun- 

 tains; Dog Spring; Guadalupe Canyon; Cactus Flat. 

 The type of Orobanche xanthochroa was collected near- Pecos. 



3. THALESIA Raf. Cancer root. 



Low herb, 10 cm. high or less, with pale yellowish or pinkish stems, solitary or 

 few together, bearing a few terminal flowers and scalelike leaves, the latter mostly 

 at the base of the stem; flowers on slender pedicels; calyx lobes nearly equal, acute 

 or acuminate; corolla sometimes more deeply colored than the rest of the plant, the 

 tube curved, the limb slightly 2-lipped, the upper lip often 2-lobed, the lower spread- 

 ing, with 3 more or less unequal lobes; stamens included; ovary 1-celled, with 4 

 placentae. 



1. Thalesia fasciculata (Nutt.) Britton, Mem. Torrey Club 5: 298. 1894. 



Orobanche fascicidata Nutt. Gen. PI. 2: 59. 1818. 



Aphyllon fasciculatuni Torr. & Gray in A. Gray, Man. ed. 2. 281. 1856. 



Type locality: "In sandy alluvial soil about Fort Mandan," North Dakota. 



Range : British Columbia and California to Saskatchewan and Texa^s. 



New Mexico: Mogollon Creek; Barranca; Carrizo Mountains; Organ Mountains; 

 GHmores Ranch; Kingston; Winsors Ranch. Parasitic on the roots of various plants. 



131. BIGNONIACEAE. Bignonia Family. 



Shrubs or low trees with simple or pinnate exstipulate leaves and large perfect 

 flowers in terminal racemes; calyx hypogynous, of 2 more or less united sepals; corolla 

 irregular, large, fuiinelform, 2-lipped, deciduous; stamens 5, 1 or 3 reduced to sterile 

 filaments; ovarj' 1-celled with 2 parietal placenta or 2-celled by a false partition; 

 style 1; stigmas 2; fruit a slender terete capsule, with numerous winged seeds. 



The two species of Catalpa, natiA^es of the Central and Southern States, are sometimes 

 cultivated as shade trees in New Mexico. 



key to the genera. 



Leaves simple; llowors i:)urplish 1. Chilopsis (p. 601). 



Leaves pinnate; flowers bright yellow 2. Stenolobium (p. 601). 



