3. Oxypolis Fendleri (Gray) Heller. Fig. 597. 



Glabrous caulescent perennial, 3-6 dm. high, from fascicled tubers; leaves with 

 dilated sheaths, oblong in outline, simply pinnate, 5- to 9-foliate; leaflets broadly 

 ovate to narrowly lanceolate, obtuse, crenate-dentate or incisely serrate, rarely 

 incised. 2.5-5 cm. long; peduncles 8-20 cm. long; inflorescence of loose compound 

 umbels; rays unequal, 5 to 12. 1-3.5 cm. long; involucre and involucels wanting; 

 calyx teeth conspicuous; corolla white or purple; stylopodium conic; fruit oblong 

 or oval, about 4 mm. long, glabrous, strongly compressed dorsally, the dorsal ribs 

 filiform, the lateral ones broadly thin-winged, the oil tubes large and solitary in the 

 intervals (2 to 4 on the commissure), the seed face plane. 



In water of small streams, bogs or streamsides in partial shade in Ariz. (Apache 

 Co.) and N. M. (Taos, Rio Arriba, San Miguel, Santa Fe and Socorro cos.), June- 

 Aug.; Wyo. to N.M., s.e. Ut. and Ariz. 



26. Heracleum L. Cow-parsnip 

 A circumboreal genus of about 60 species, only one native to North America. 



1. Heracleum lanatum Michx. Masterwort. Fig. 598. 



Coarse rank-smelling pilose to lanate perennial, 1-2.5 m. high, with fistulose 

 ribbed stems; leaves pinnately or ternately divided (especially above); leaf seg- 

 ments palmately cleft or parted, ovate, those of the upper leaves 1-2 dm. long, 

 serrate; petiole sheaths conspicuously expanded, 2-5 cm. wide when spread out; 

 umbels compound, axillary and terminal; peduncles tomentose to villous, 5-25 cm. 

 long; involucral bracts linear, 1-2 cm. long, deciduous; rays usually 20 to 30, 

 spreading to ascending, 3-10 cm. long; involucel similar to involucre; pedicels 

 7-18 mm. long; petals white, unequal, those of the perfect flowers ligulate to 

 obovate, lobed or bifid, 3-9 mm. long, those of the staminate flowers smaller, 

 more regular; fruit puberulent or glabrate, obovate, 8-12 mm. long; mericarps 

 strongly flattened dorsally, the 4 brown oil tubes clearly visible on the dorsal sur- 

 face. H. maximum Bartr. 



Meadows, stream banks and other wet areas in Ariz. (Graham, Pima, Apache* 

 and Navajo cos.) and N. M. (Colfax, Taos, Rio Arriba, San Miguel and Santa 

 Fe COS.), June-Aug.; widely distributed in U.S. and Can. 



27. Eryngium L. Eryngo 



Plants creeping to erect, caulescent or acaulescent, usually glabrous, herbaceous, 

 annual, biennial or perennial from stout taproots or rootstocks bearing fibrous roots; 

 leaves coriaceous or membranaceous, entire to pinnately or palmately lobed to 

 divided, often ciliate to spinose, the venation parallel or reticulate, the petioles 

 sheathing and sometimes septate; inflorescence capitate, the heads solitary or in 

 cymes or racemes; involucre of one or more series of entire or lobed bracts sub- 

 tending the head; involucel of entire or lobed bractlets subtending the flowers; 

 flowers white to purple, sessile; sepals ovate to lanceolate, obtuse to acute, entire 

 or rarely spinescent, persistent; stylopodium lacking; carpophore lacking; fruit glo- 

 bose to obovoid, scarcely compressed laterally, variously covered with scales or 

 tubercles, the ribs obsolete, the commissure broad; oil tubes mostly 5, inconspicu- 

 ous; seed face plane or slightly concave. 



A genus of more than 200 species, in the temperate and warmer parts of the 

 world, with important centers of development in Brazil-Paraguay, Mexico, western 

 Asia, the Mediterranean region, and southeastern and western United States. 



1. Leaves parallel-veined; plants with a monocotyledonous habit (2) 

 1. Leaves reticulate-veined; plants not monocotyledonoid (4) 



1253 



