TABLE I 
Chromosome numbers of Chihuahuan Umbelliferae. 
Name 
Voucher 
Specimen* 
Municipio and Locality 
Donnellsmithia 
1. ternata(S.Wats.) C. & R. 
2, stlvicola Const. & Bye 
Tauschia 
3. bicolor Const. & Bye 
4. tarahumara Const. & Bye 
Arracacia 
5. edulis S.Wats. 
Ligusticum 
6. Porteri C. & R. 
Pseudocymopterus 
7. montanus (A.Gray)C.& R. 
Prionoseiadium 
8. madrense 5. Wats. 
Eryngium 
9. fluitans M.E. Jones 
10. Gentryi Const. & Bye 
11. heterophyllum Engelm. 
12. Lemmonii C. & R. 
13. phyteumae Delar.f. 
44: 
20 
11 
Bye 4393 
Bye 6376 
Bye 3863 
Bye 6388 
Bye 6753 
Bye 6651 
Bye 6637 
Bye 6352 
Bye 4763 
Bye 4766 
Bye 4334 
Bye 4463 
Bye 4809 
Bye 5905 
Guachochi, Cusdrare 
Guazapares, San Rafael- 
Las Lagunitas 
Batopilas—Urique, between 
Quirare and Basigochic 
Bocoyna, San Ignacio 
Arareco 
Guachochi, Cusdrare 
Bocoyna, W of Creel 
Bocoyna, W of Creel 
Batopilas, S of Quirare 
Bocoyna, W of Gonogochi 
Bocoyna, E of Gonogochi 
Bocoyna, Gonogochi 
Batopilas, N of Quirare 
Bocoyna, Creel—San 
Ignacio Arareco 
Bocoyna, W of Creel 
* Voucher specimens are preserved in ECON, GH and UC. 
