APPENDIX. 



485 



§ 2. MUCRONEA, T. & G. Involucre 2-4-sided, 2-4-lol3od, chaitaoeous-coriaoeous, the lotee hert- 

 aceous straight-awned : stamens 9, inserted at the hase of the 6-parted calyx. Annuals of South- 

 ern California, panicnlately much branched; involucres in the forks and scattered upon the 

 slender branches; cauline leaves and bracts similar, amplcxicaul, more or less stellately 3-lobed, 

 cusped or awned ; flower more or less pedioelled. 



. •.^!" C-i'EKFOLiATA,Gray. Slightly hirsute and glandular or glabrous; leaves perfoliate ; involucre 

 4-8ided, the teeth shortly and unectually subulate-awned ; calyx-segments laciniate above 



13. C. Califoiwica, Gray, More hirsute ; leaves clasping, the upper deeply 3-lobed ; involucre com- 

 pressed, usually 2-lobed and 2-awned, rarely 3-4-sided, the additional awns shorter; calyx-lobes entire. 



J 3. ACANTHOGONUM, T. & G. Involucre 3-5-toothed or lobed, coriaceous, the tube transversely 

 veined or ridged, the lobes unequal, immarginate ; stamens 6-9, on the throat of the 6-lobed calyx 

 the filaments and anthers short. Dwarf annuals, with ovate or spatulate entire petioled pointless 

 loaves, the involucres more or less clustered ; flower pedicelled, slightly bracteolate. 

 * Involucre broadly triangular, 3-ribbed, 5-toothed; bracts unarmed. 



14. C. POLYGONOIDES, T. & G. Diffusely much-branched, depressed, loosely hirsute pubescent, 3-4' 

 high ; leaves and bracts spatulate, the uppermost sometimes mucronate ; involucres rather loosely panic- 

 ulate-clustered, at length hardened, the 3 lobes triangular-subulate and awned with a somewhat hooked 

 spine, the 2 intermediate ones smaU ; stamens 6.— California, (Rattan.) 



* * Involucre triangular, G-rlbbed, trifid ; bracts spiny. 



15. C. RIGIDA, T. & G. Dwarf, woolly or tomentose; involucres sessile, surrounded by the elon- 

 gated awn-shaped at length indurated bracts, the lobes unequal, with a straight cusp, and longer than 

 the short tube ; stamens 9. See page 312. 



'' * * Involucre with a narrow terete tube without ribs, the 3-5 teeth and the rather small bracts 

 short-cuspidate. Dwarfed annuals, 1-3' high, at length subcymosely branched. 

 • 16. C. COEEUGATA, T. & G. White- wooUy ; leaves ovate or round-oval ; tube of the involucre nearly 

 ■2" long, subclavate, strongly corrugated, a little shorter than the 3 ovate-lanceolate curved-pointed 

 lobes ; calyx-tube attenuate at base ; stamens 6-9.— S. California. 



17. C. Watsoni, T. & G. Hoary-pubescent ; involucral- teeth 5, very unequal, 1-2 dilated and leafy ; 

 calyx-tube oylindric ; stamens 9. See page 313. 



ALLIUM. 



A comparison of the specimens belonging to this genus in the herbariums of Dr. Gray, Dr. Torrey, 

 and Prof. Eaton, is the basis of the following synopsis. It appears that considerable assistance in the 

 determination of the species may be derived from the characters of the rootstock and bulb-coatings, and 

 that the cresting of the capsule is subject to little variation, though in some species becoming somewhat 

 obscured in the mature fruit. The comparative lengths of the style and stamens, and the size, shape and 

 color of the segments of the perianth are usually rather less constant. The fibrous network or cellular 

 reticulation that occurs in some or all of the outer or inner coatings of the bulbs in several of the species, 

 (either distinguishable by the naked eye or under a simple lens, or in some species requiring a rather 

 higher power for its satisfactory definition,) is to a very good degree constant in its characters and fre- 

 quently very distinctive. Our species may be thus arranged : — 



§ 1. Cells 1-ovuled. Bulb crowning an evident perennial rootstock; coatings usually fleshy ; capsule 

 not crested. 



1. A. TKicoccuM, Ait. Leaves oblong-elliptical ; coatings sometimes coarsely fibrous. — N. England 

 to Wisconsin and south to Kentucky and N. Carolina. 



§ 2. Cells 2-ovuled ; 0-2-seeded. 

 * Bulb crowning a perennial rootstock, the coatings membranous without distinguishable cross-retic- 

 ulation ; spathe 2-3-valved, (in A. iremtylum 1-valved.) 



(a.) Capsule crested. 



2. A. SCHCENOPEASUM, L. Lcavcs awl-shapcd, hoUow; Umbel Capitate, the pinkish sepals exceeding 

 the pedicels and stamens ; capsule slightly crested.— Canada and the upper lakes to the Saskatchewan, 

 Washington Territory and Alaska, (584 Geyer;) Wind River Mountains, Wyoming, (Fremont;) Walla- 

 WaUa River, Oregon, (Tolmie.) 



