134 COULTER AND ROSE 



19. Museniopsis pubescens C. & R., sp. nov. 



Stems tall and much branched, 9 dm. high, pubescent throughout; 

 basal leaves twice ternate ; ultimate divisions ovate, irregularly lobed, 

 with callous apiculation ; umbel with numerous rays, no involucre, and 

 involucel of a few linear bractlets; rays 2 to 3 cm. long; pedicels 4 

 to 7 mm. long; flowers white; fruit (immature) pubescent, oblong, 4 

 mm. long. 



Chihuahua: in the vSierra Madre, Nelson 60S7, June 21, 1899. 



This is a peculiar species, and mature fruit may show that it belongs 

 elsewhere. 



17. TAUSCHIA Schlecht. Linnaea 9: 607. 1834. 



The genus Tanschia\N?^% established by Schlechtendal in 1834 upon 

 a single sjDecies, T. midicaiilis. Two species, T. coulteri and T. 

 texana^ were described by Dr. Gray in 1853 (Plantae Lindheimerianae 

 2 : 211); and a fourth one indicated but not named by Mr. Hemsley in 

 the Biologia Centrali-Americaita. T. coulteri has recently been trans- 

 ferred to Arracacia\ T. texana has been made the type of a very 

 distinct genus, Museniopsis', while the species cited without name 

 is probably not a Tauschia. This leaves Tauschia with but one of 

 the four species cited by Hemsley. 



To the genus Arracacia, however, certain anomalous species have 

 been referred from time to time which more properly belong to Taus- 

 chia^ and these are now transferred to it, which with four new species 

 increases the number to eleven, all but the type being endemic, and 

 separating it more clearly from Arracacia. The genus Tauschia, as 

 outlined above, contains forms of low acaulescent habit, with pinnate 

 leaves, obtuse ribs, and no stylopodium. With this definition it in- 

 cludes the following species, although T. seatoni and T. Jiliformis 

 may belong elsewhere. 



Synopsis of the Species. 



Oil-tubes solitary in the intervals. 

 Acaulescent or weak cavilescent. 

 Flowers yellow ; bractlets short. 



Involucel with palmately lobed or cleft bractlets. 



1. T. nudicaulis. 

 Involucel with bractlets linear and entire. 



Short-caulescent, weak plants ; flowers yellow. 



2. T. decjirnbens. 

 Acaulescent, with erect scape ; flowers white. 



3. T. seatoni. 

 Flowers not yellow ; bractlets elongated 4. T. filiformis. 



