600 CONTRIBUTIONS FEOM THE NATIONAL HERBARIUM. 



KEY TO THE SPECIES. 



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



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



1. Myzorrhiza multiflora (Nutt.) Rydb. Bull. Torrey Club 33: 151. 1906. 

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

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



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

 Type collected by Gambel. 



Range: Utah and Colorado to California and Texas. 



New Mexico: Upper Pecos; Zuni; Socorro; San Marciai; Mesilla Valley; Gihnores 

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



2. Myzorrhiza ludoviciana (Nutt.) Rydb. in Small, Fl. Southeast. U.S. 1093. 1903. 

 Orobanche ludoviciana Nutt. Gen. Bl. 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 Fort Mandan," 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. Canceb root. 



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

 few together, bearing a few terminal flow T ers 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 j'asciculata Nutt. Gen. PI. 2: 59. 1818. 



Aphyllon fasciculatum 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 Texas. 



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

 Gilmores 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, funnelform, 2-lipped, deciduous; stamens 5, 1 or 3 reduced to sterile 

 filaments; ovary 1-celled with 2 parietal placentae 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, natives of the Central and Southern States, are sometimes 

 cultivated as shade trees in New Mexico. 



key to the genera. 



Leaves simple; fiowera purplish 1. Chilopsis (p. 601). 



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



