76 A.MAEYLLIDACEAE. 



long, straight or gently curved, rather acuminately deltoid often from oblique 

 green prominences, or with lenticular bases, the intervening margin nearly 

 straight; inflorescence, flowers, fruit, and bulbils unknown. 



Acklin's Island. Endemic. Acklin's Island Centurt-plant. 



6. Agave indagatorvun Treleaae, Mem. Nat. Acad. Sei. 11: 42. 1913. 



Acaulescent, not cespitose. Leaves somewhat grayish and at first very 

 glaucous beneath, lanceolate, somewhat concave, gradually acute, 20-25 by 

 150-250 cm.; spine chestnut, smooth, rather glossy, nearly straight, conical, 

 involutely grooved to the middle, 3 by 12 mm., decurrent for about its own 

 length; prickles 5-12 mm. apart, about 1 mm, long, straight or slightly re- 

 curved, narrowly triangular, not lenticular at base, the somewhat membranous 

 at first slightly pink intervening margin straight; infiorescence 9 m. high, 

 paniculate; pedicels 15-20 mm. long; flowers unknown; capsules narrowly 

 oblong, '20 by 55-60 mm., thick-stipitate, acuminately pointed; seeds 5 by 7-8 

 mm. Said by Dr. Britton to be bulbiferous. 



Rocky soil, Watling's Island. Endemic. Watling's Island Centubt-plant. 



7. Agave Nashii Trelease, Mem. Nat. Acad. Sci. 11: 45. 1913. 



Acaulescent, cespitose. Leaves gray-green, sometimes purple-tinged, gray- 

 green, somewhat glaucous and transversely banded, attenuate-oblong, concave, 

 4-5 by 30-50 cm.; spine purplish brown, smooth, somewhat polished and 

 recurved or upcurved toward the end, conical tapered, narrowly slit-grooved 

 to beyond the middle, 3 by 15 mm., decurrent; prickles usually 3-5 mm. apart, 

 scarcely 2 mm. long, straight or somewhat curved, acuminately triangular, 

 sometimes nearly or quite confiuent, the intervening margin nearly straight; 

 inflorescence 3.5-4 m. high, the upper third or more very loosely paniculate 

 with slender outcurved branches; pedicels 5-10 mm. long; flowers light yellow, 

 35 mm. long; ovary 20 mm. long, exceeding the perianth, subfusiform or 

 obovoid in development; tube openly conical, 3 mm. deep; segments 3 by 10 

 mm., half as long as the ovary; filaments inserted nearly in the throat, 25 mm. 

 long, more than twice as long as the segments; capsules oblong or oblong- 

 pyriform, 20 by 35 mm., or less, slightly stipitate and beaked; seeds 4 by 

 4—5 mm. 



Sandy soil, Inagua. Endemic. Nash's Century-plant. 



8. Agave inaguensis Trelease, Mem. Nat. Acad. Sci. 11: 47. 1913. 



Habit of A. Nashii. Leaves typically white-glaucous, oblong or oblanceo- 

 late, more quickly acute, flatter, sometimes plicate, 6-9 by 40-60 cm. ; spine 

 often shorter and stouter; prickles closer, 2-3 mm. apart, more recurved and 

 less uniform, very narrowly triangular, almost continuously joined by a narrow 

 blackish border; inflorescence and fruit unknown; pedicels 5-10 mm. long; 

 flowers yellow, 50 mm. long; ovary 25-30 mm. long, exceeding the perianth, 

 subfusiform ; tube open, 5 mm. deep ; segments 5 by 15-17 mm., half as long as 

 the ovary; filaments inserted nearly in the throat, 35 mm. long, fully twice as 

 long as the segments. 



Little Inagua ; South Calces. Endemic. Inagua Centuet-plant. 



9. Agave sisaUna (Engelm.) Perrine, House Rep. Document 564: 8. 1838. 



Agave rigida sisalana Engelm. Trans. Acad. St. Louis, 3: 316. 1876. 

 Agave sisalana armata Trelease, Mem. Nat. Acad. Sci. 11: 49. 1913. 



Subacaulescent. Leaves finally green and somewhat glossy, at first lightly 

 glaucous and transversely banded on the back, linear-lanceolate, nearly flat, 

 about 10 by 150 cm.; spine dark brown, somewhat pitted and glossy, tumidly 



