population. Indeed, this characteristic may be the key 
to the survival of the population in the immediate future, 
because a road building program will destroy the site 
within the next year. 
Although plants relatively similar to T'auschia bicolor 
in habit may be found in such genera as -fletes and Arra- 
eacia as Well asin Tauschia, the combination of glabrous 
herbage, ternate or pinnate leaves with serrate to pinnati- 
fid leaflets, fertile outer rays, dimidiate involucel, stout 
pedicels with an often subsessile central fruit, petals 
purple/red externally and white internally, very slender 
styles, and a bipartite carpophore with bifid halves ap- 
pears to be unique. 
Tauschia tarahumara (Constance & Bye sp. nov. 
Plantae humiles breviter caulescentes glabrae, caulibus 
pluribus 12-30 cm. altis e caudice elongata ramosa car- 
nosa, praeter inflorescentiam puberulentam; folia ovata 
3-5 cm. longa, 2-4 em. lata, 2~-8-pinnata, divisionibus 
ultimis lineari-filiformibus breviter mucronatis 5-20 mm. 
longis, ca. 0.5 mm. latis; petioli 1-6 cm. longi graciles 
anguste scarioso-vaginantes; folia caulina reducta sessilia 
vaginis conspicue scariosis praedita; pedunculi 6-12 cm. 
longi plerumque terminales graciles sub umbella puberu- 
lentes; involucrum nullum; involucellum nullum ; radii 
6-12 usque ad 1 cm. longi puberulenti; pedicelli 1-38 
mm. longi eis exterioribus fertilibus: flores rhodo- 
purpurei; styli erecti ca. 0.5 mm. longi; carpophorum 
bifidum; fructus ovoideus 5-7 mm. longus, 8-5 mm. 
latus ad apicem versus truncatus basi rotundatus, costis 
humilibus rotundatisque quam intervallis latioribus; vit- 
Prare LXIITL. Vauschia tarahumara Const. & Bye. a, Habit, <4; b, 
basal leaf, “1; c, seedling, ~1; d, carpophore, 5; e, fruit tran- 
section, “7; f, mature fruit, » 4: g, flowering umbellet, 5; h, 
petal, ~ 20, a-b, g-h, from Bye 6288; c, from Bye 7027 (Const. 
1918); d-f, from 7027. 
