2.5-8 mm. long, longer than sepals; fruit (immature ) 
ovoid, about 2 mm. long and broad, the squamae ovate, 
subequal, flattened, the dorsal faces densely squamose ; 
chromosome number ”=7. 
Tyree: Chihuahua: Municipio de Ocampo, transition zone, pines, 
meadow, infrequent, marginal to streams, elevation 7500 feet, Meme- 
lichi, Rio Mayo, 16 September 1936, H.S. Gentry 2770 (UC: holo- 
type: kK). 
Oruer coLLections: Chihuahua: Municipio de Madera, lake near 
Chuichupa, 23 August 1936, H. LeSueur 817 (UC); Chuichupa, 7000 
feet, 21 September 19038, /.h. Diehl s.n. (POM): Municipio de Bo- 
coyna, in moist meadow E of Gonogochi (on Continental Divide) E 
of Creel, associated with low, scrubby Quercus, grasses, Ranunculus, 
Cacalia and Tagetes lucida, elevation ca 7500 feet, 24 August 1973, 
Robert 4. Bye, Jr. 4766 (ECON, UC). 
Kryngium Gentryi represents a third member of Sec. 
XN XI. Madrensia Wolff, comprising Mexican species of 
wet habitats characterized by evidently transversely sep- 
tate leaves, bluish or purplish ovoid-globose to ovoid- 
cylindrical heads, and involucral bracts conspicuously 
silvery above (Wolff 1918). The other two species, /. 
madrense S. Wats. and 7. fluitans M.K. Jones (27. meai- 
eanum sensu Wolff, 7. Wolffit Mathias), are very similar 
in habit. ‘There is a resemblance also to Ht. phyteumae 
Delar.f. (Sect. NNIV. Stellata Wolff), but this pos- 
sesses well developed oblong to lanceolate, reticulately 
veined leaf lamina. In Sect. Madrensia, the leaves are 
usually bladeless or with a rudimentary lamina and not 
only the petiole but the entire leaf tends to be septate. 
The silvery upper surface of the involucral bracts sug- 
gests an affinity to both Sects. NXNIV. Stellata Wolff 
and NNV. Carliniformia Wolff. Wolff notes that /. 
phyteumae ‘‘bildet einen deutlichen Ubergang zu den 
Madrensia’” (Wolff 1913, 61: 186). From its two allies 
in Sect. Madrensia, 47. Gentry: differs in its possession 
of a rootstock, its fewer globose heads without a coma, 
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