APPENDIX. 
497 
noticed have very narrow leaves, the former 6", the latter 4-5" wide. About St. George, Utah, a form 
occurs witli leaves only 2" wide. 
§2. HESPERO-YUCCA. Filaments thickened upward, acute, smooth, mostly longer than the pistil, 
erect; anthers didymous, broader than long ; ovary oval, the slender?style tipped with a broad short 
, 3-lobed stigma, bearing numerous filiform papillae; erect capsule loculicidally 3-valved from the 
apex, valves entire, undivided ; seeds thin, smooth, with entire albumen. 
4. Y. Whipplei, Torr. Bot. Mex. Bound. 222. Stems none or short, prostrate ; leaves few, often fal¬ 
cate/ rigid but not thick, gradually widening toward the broad base, roughbn the margin, sharp-pointed, 
striated, glaucous, 12-18' long, wide or less ; flowers panicled; petals lanee-oval, 1|~3'long; capsule 
small, ovate or obovate, obtuse / seed narrowly margined.—From N. W. Arizona to the mountains and 
coast ranges of S. California ; it may be expected in S. Utah. Flowers very different in size, some speci¬ 
mens with the largest in the genus ; style sometimes 4s long as the ovary .or much shorter. 
The following genus is founded on a plant from W. Texas, originally described as a doubtful Yucca, , 
then as an Aloe, but evidently distinct from both. 
HESPERALOE, Eng. N. Gen. 
Perianth cylindric, of 6 (reddish) petal-like linear obtuse leaves, united at base, withering-persistent, ; 
the outer ones cucullate at apex ; filaments from a broad adnate base, subulate-filiform, Of the length of 
the perianth, geniculate-inflexed below the tip; anthers oblong, bifid below; ovary ovate, 3-celled, 
several timeS'shorter than the filiform style; small capitate stigma exsert; capsule 3-celled, 6-valved, with 
6 rows of thin black horizontal Yucca-like seeds, with a linear diagonal embryo of the length of the 
albumen.—COrm bearing the Yucca-like filamentose-margined leaves and a scape, with the fascicled flowers > 
in a spike or few-branched panicle. The leaves, pollen, 1 and seeds are those of a Yucca, the perigon and 
pistil that of an Aloe; the filaments, being adnate at base and geniculate upwards, resemble those of an 
Agave. 
Hesperaloe YUCCvEFoniA, Eng. ( Yucca (?) parvijlora, Torr. Bot. Mex. Bound. 221. Aloe yucccefolia, 
Gray. Proc. Amer. Acad. 7. 390.) 
AGAVE, L, 
Perianth tubular, funnelform or campanulate, persistent, 6-parted, the divisions nearly equal. 
Stamens 6 ; filaments more or less adnate to the tube, inflexed in the bud, at last exsert; anthers linear, 
versatile.. Pod coriaceous, 3-celled, loculicidally 3-valved from the apex. Seeds many, black, flat, hori¬ 
zontal, in 2 rows in each cefr—Leaves thick and fleshy, mostly terminating in a spine, on the margins 
spiny-toothed or often caMaginous-denticulate or rarely filamentous or entire, clustered at the base of 
the many-flowered scape from a thick fibrous-rooted crown or on the top of a short trunk. 
A. Utaiiensis, Engelm. A r . sp. Leaves basal, Stout, very fleshy, tapering from a broad base and 
terminating in a long channeled spine, herbaceous on the sinuate margins between the horny flat teeth ; 
scape bearing a dense spike of small yellowish flowers in fours or pairs; the oblong obtuse erect lobes 
of the perigon ashing as the ovary, 3-4 times the length of the short campanulate tube ; stamens from 
the middle of the tube, together with the style slightly exsert; anthers of the length of the lobes ; capsule 
cylindric-ovate, acute.—About St. George, Utah, (Dr. E. Palmer, J. E. Johnsen.) Leaves at base lf-2' 
wide, 5' long, with stout broad-white straight or rarely recurved spines on the margin •; terminal spine % 
whitish, nearly V long ; each leaf marked with the impressions of the teeth of those next to it; scape 5-6° 
high ; flowers, ovary included, about V long, tube very shallow, scarcely more than 1" long; capsule and 
seeds among the smallest in the genus, the former 9-10" long, the latter 1^-2" in longest diameter. A 
Allied with A, heteracantha, Zucc., (A. Poselgeri, Salm. A. Lecheguilla, Torr.,) which extends from Mexico 
into New Mexico and Arizona, 
1The Pollen-cells of Yucca are globose, 0.055-0.065 mm. diam. ; those of Hesperaloe are similar but only 0.050-0.055 mm 
diam., and those of Aloe 0.030-0.050 mm. diam., globose when fresh, but when dry lanceolate, folded or grooved, (much like 
those of Hyadnthus and many other Liliacece,) slowly becoming globose when soaked'. 
at to 
