OF ARTS AND SCIENCES. 253 
ovate to lanceolate bracts: flowers crowded, erect on very short pedi- 
cels, fetid, greenish white; segments narrowly lanceolate, 1} to 2 
inches long: stamens half the length of the ovary: stigmas short, 
sessile: fruit ovate, 2 or 3 inches long. — King’s Rep. 5. 496, and 1. c. 
47. Y¥. Draconis, var. (?) arborescens, Torr. Pacif. R. Rep. 4. 147. 
Southeastern California to S. Utah. 
+ + + Fruit capsular, septicidal and at length loculicidal at top, erect: seeds 
thin, smooth, broadly margined,* with entire albumen. Caudex none or 
short, the panicle upon a tall scape. 
++ Leaves serrulate. 
7. Y. RUPICOLA, Scheele. Acaulescent: leaves a foot or two long 
by an inch or two wide, rigid, erect and pungent, smooth, deep green, 
mostly oblique and undulate or twisted, with coarse reddish serratures : 
scape 4 to 7 feet high, with long and narrow bract-like leaves: panicle 
pyramidal, few-flowered ; bracts small: flowers greenish white; seg- 
ments ovate, sharply acuminate, 1} to 3 inches long: stamens straight, 
equalling the ovary: style slender: capsule 6-sided, acute or beaked, 
2 or 2} inches long: seeds 3} to 4 lines broad. — Linnea, 23. 1438; 
Engelm. l. c. 48. Y. lutescens, Carr. Western Texas. 
Var. RIGIDA, Engelm. 1. c. Leaves pale and glaucous, not twisted, 
carinate and often rough on the back, 8 to 12 inches long by 3 to 6 
lines wide: capsule and seeds smaller.— Eastern New Mexico and 
Northern Mexico. 
++ ++ Margin of the leaves filamentose. 
8. Y. ANGUSTIFOLIA, Pursh. Leaves straight, very stiff and 
pointed, usually 1 to 3 feet long by 3 to 6 lines wide, smooth: raceme 
usually simple, nearly sessile, 1 to 4 feet long: flowers greenish white 
or tinged with brown ; segments broadly ovate, an inch or two long: 
stigmas green, shorter than the ovary: capsule 6-sided, 3 inches long, 
half as wide: seeds broadly margined, 5 or 6 lines broad. — Sims, Bot. 
Mag. t. 2236; Engelm. 1. ¢. 50. Dakota to New Mexico. 
Var. ELATA, Engelm.1.c. Caudex 3 to 5 feet high, with numerous 
glaucescent sometimes éntire leaves } to 1} feet long: panicle oblong 
or lanceolate, 3 or 4 feet long, as long as the peduncle: fiowers white, 
with narrower segments. — Y. constricta, Buckl. Proc. Philad. Acad. 
1862,8? W. Texas to Utah and Northern Mexico. Various culti- 
vated forms are probably referable to this (Baker, Gard. Chron. 
1870, 1088). 
Var. MOLLIs, Engelm. |. c. Acaulescent: leaves softer and less 
pungent, broadest (5 to 8 lines) in the middle: raceme or panicle } to 
