HA-\VORTHIA 



9. margaritifera, Haw. [H. uu'tjcr, Duval. AUe mar- 

 gariiifera, Burm. ). Lvs. turgiil, si.ireaiUnfr, merely acute, 

 both faces with scattered coarse white tubercles, which 

 often turn green on the upper surface. P.U. 57. Varies 

 into several named forms. 



DD. The lvs. less conspicuousli/ ivliilf'tuhirculalc. 



10. nigdsa, Bak.(..lWc;-?((;d.s'(t, Salm-Dvck. H.Kdduln 

 asph-ior) . Lvs. long attenuate, spreading, plano-convex, 

 both faces with irregularly placed, rather coarse green- 

 ish tubercles. 



HECHTIA 



715 



1022. Havvorthia Reinwardtii. 



11. subuUta, Bak. {Aloe subuldta, Salm-Dyok). Like 

 the preceding:, but the scattered or rugoselj' confluent 

 tubercles very small, whitish. 



12. Radula, Haw. {Aide l-^adxla, Jacq. Ap)cra J\il- 

 diila,'\\i\ld.). Ijvs. shorter, the white tubercles finer. 

 Cape. 



13. h^brida, Haw. Lvs. short, more turgid, the upper 

 face somewhat rugose, the lower with scattered gret-n 

 tubercles. Cape ? 



CC. Shape of lvs. orate to ileltohl, ^iuecitlenf, )iot ixber- 

 ciilate. spfeaJi)ig, (he rosette oftmi aonuu-hut 

 elongated. 



14. tessellktSL, Haw. (Aloe ievseUdta,Sc]ixi\t.t.). Lvs. 

 acute or acuminate, setosely denticulate, scabrous be- 

 neath, the smooth upper surface with pale lines anas- 

 tomosing in squares. 



15. reciirva, Haw. (Aide recurva. Haw. Ap)cra rr- 

 ciirva .'SVilld. ) , Lvs. entire, scabrous beneath, the smooth 

 upper surface longitudinally pale striate. B.M. 1333. 



16. cymbifbrmis, Haw. (-ff. co)?c(^i'«, Haw. Aloe ci/mhi- 

 fSrmif!, Haw. A. ci/iubcvfdlia ^ Schrad. ^l/))c)-<i ci/uibir- 

 fdlia^ Willd. ). Lvs. entire, smooth, rather obtuse, longi- 

 tudinally striate. B.M. S02. 



ceo. Shape of lvs. cuneatelij prismatic, pellucid. 



D. 17;e lvs. erect, ohliquehj truncate, with deltoid, jyale- 



striate apex. 



17. mirabilis, Haw. {Aloe niirabilis. Haw. Ap}era 

 mirdbilis, ^XiUd.). Lvs. ciliate-dentimlate on margin 

 and keel, sparingly tubereulate beneath. B.M. 135-4. 



18. asp6rula, Haw. {Aide a spth-ula, Sch\\]t. f.]. Lvs. 

 entire, finely scabrous, 



19. retiisa, Haw. {Aloe reti(sa, Linn. Ap'icra retu.^n, 

 Willd. Catev{ila rctusa, Medic). Lvs. entire, smooth. 

 B.M. 455. 



DD. The Irs. rrecto-spreading, pointed, smooth. 



20. cuspidata, Haw. {Aloe ciispidt'tta, Schnlt. f.). Lvs. 

 stout, rather amrave, entire, nearly erect, the aetulose 

 apex ob.scurely longitudinally or reticulately striate and 

 sometimes truncate, but very obliquely so. 



21. tiiririda, Haw. {Aide turgidn, Schult. f.). Lvs, 

 small, spreading, very turgid, acute, entire, longitudi- 

 nally striate. 



22. reticulata, Haw. f. 4 /()t'n'/uv(/(i/n. Haw. A.pumila, 

 Linn. A . herbiicea. DC. A . a^-achno'ides reticiildta. 

 Ap}cra retfri(ti(ta, Willd.}. Lvs. as in the last, or 

 slightlv ciliate on the angles, the striations anastomo- 

 sing. B.M. i;U5. L. B.C. 14:1354. 



23. altilinea, Haw. {R. mneronata, H. limpida and 

 R. aristittii. Haw. Aloe altilinea, Schult. f . ) . Lvs. en- 

 tire, aristatLdy pointed, longitudinally striate. 



24. arachnoldes,Haw.(.4/()f ff?-ar7()iok7e(/., Mill. Ap\cra 

 araehno'ides, Willd. Catevala- ar<ieh)io'idea. Medic). 

 Lvs. more flattened-triquetrous, aristately pointed, the 

 angles ciliate-toothed. B.M. 750. 



BB. Margin and keel of Irs. horny-bordered. 

 25. Albicans, Haw. (^. la, -is, Haw. Aloe la:vigdto, 

 Schnlt. A . (fthicans, Kiiw. A. ma rgin(ita,Lian\. Ap\cr<i 

 albicans, \\\\\d.). Lvs. broad, 3-sided, acute, entire, 

 smooth <tr with a few dorsal tubercles, white-bordered- 

 B.M. 1452. 



William Trelease. 



HAWTHORN. See CraU 



rgus. 



HAWTHORN, EAST INDIAN. IHaphiolepis orata. 



HAZARDIA (Barclay Hazard. Californian botanist). 

 Co)Hpt'sitir. This includes a small Californian subslinib, 

 with silvL-'ry lea\'es and peculiar, not pretty, heads of fls., 

 borne in Au.i,nist. It is suitable for rockeries nnd bed- 

 ding out, but there are better woolly-leaved plants in 

 cult. The genus has about 4 species of stout, tomentose, 

 deciduous shrubs of the islands off the coast ot Calif.: 

 heads white-tomentose, numerous, in large cymose pani- 

 cles, which terminate the branches; rays 5-8, neutral, 

 very short, ligulate or irreguhirly 5-toothed or lobed, 

 pale yellow changing to brownish purple. In 1887 K. L. 

 (.Treenemade this new genus, remarking that it differs 

 from Diplostephium mainly in habit, the paufity, re- 

 duced size, and diiferent cohir of its rays. It also lacks 

 the tuft of hairs characteristic of the style-tips of Co- 

 rethrogyne. 



det6nsa, E. L. Greene. ( CorelJn-ogt/nc detonsa, Greene). 

 Lvs. of tirm texture, 3-5 in. long, ol)ovate-obIong, 

 coarsely serrate; uppersurface of older lvs. partly di- 

 vested of the white tomentjuni which covers all other 

 parts of the plant. 



HAZEL. See 



Arella)ia. 



F. FiiANOESCHi and W. M. 

 Coriiltis. Chilean Hazel is Gevuina 



HEAL-ALL. Brunella. 



HEART'S EASE. Old Engli^^h narae for Pansy, Viola 

 tricolor. 



HEARTSEED or BALLOON VINE. Cardios}>crmum . 



HEATH, HEATHER. The common Heather of Old 

 World literature is a hardy plant, Calluna vulgaris. 

 The greenhouse Heaths are from the Cape of Good 

 Hope and Europe, and belong to the genus Rrica. Fur 

 St. Dabeoc's Heath, see Dabaeia. 



HEATING is discussed under Greenhouse Reatino. 

 Constraedon and 21anage)ne)it . 



HEBECLfNITJM. All referred to £upatorium. 



HfiCHTIA (J. G. H. Hecht, who died in 1S37). Bro- 

 meliacea:. A genus of 15 species of Mexican succulent 

 plants, one of which is perhaps cult, in a very few fan- 

 ciers' collections of tender plants for its dense rosettes 

 of recurved spiny lvs., which are purple above from the 

 middle to the tip and silvery beneath. The genus is distin- 

 guished by having dicecious tis. The fls. have no decora- 

 tive value, being one-third of an inch across, white, in 



