1700 



SPIR.EA 



SPIR.EA 



KEY TO THE SECTIONS. 



A. Jyvs, alti'ui/s entire: /"/.s. in simpU' or panicled 

 racemes: follicles nsuall/j 2-seedtd. (Bo- 

 tryosplra , Zabel.) 

 B. Phnifs tufted, suffruticose: fls. perfect, in 



nsKiiltjj simple racem.es 



Seotk^nI. Peteophytum (Species not in cult.) 

 BB. Plnnt (III upright shri(h with stout braiu-hvs: 

 fls. piiljKpniious in paiticled racemes ... . 



Section 2. Sibik^a (Species No. 1) 

 AA. Lvs. usiutllij serrate, nirelif entire: fls. in 

 ntnbel-like racemes, corijmbs or panicles: 

 seeds several. 

 B. Inflorescence a si>nple umhel-Uke raceme: 



(Is. irhite 



Sections. CHAM,if:i'KYoN (Species Nos. 2-20) 

 BB. Inflorescence co)ii}iiiund : fls irhite or pink. 



c. Fls. in cori/mlis 



Sei.'TIOn 4. (.'ALOsriKA (Species Xos. 21-30) 



cc. Fls. in patiicles 



Section 5. Spjraria (Species Nos. 37-49) 



INDEX. 



acuta, 2. cuneata, 21. Noljleana, 42. 



aciitifolia, 2. cinieifoli t. 21. notha, ;:i9. 



adiatitifolia, i:i. de'.'uiiiljens, 22. nova, IG. 



aliia, :i7, 44. <lensiliuru, 3U. obloni,dfo]ia., 19. 



alliirlora, ill. Douglasi, 48. obovata, 2. 



jil]iina, M- eximiti, 47. ovata, 24. 



AUoica. 1. expansa, 25. pacliystar-hys, 42. 



aquilciiifoiin. i:i. flabellat.i, 2. paniviUata. '.iS. 44. 



arbuscula. 36. flagellata, 21. Pikowiensis, 10. 



ai'fientea. 21. f lag ell if ar mis, 21. procutnhens, 22. 



argiita. 4. tiexuosa, 20. pruinosa, 37. 



atrifod'a. 20. Foiitanaysii, 'M. p-ninifolia, 6. 



atrosangninea, 27. Fontanaijsiensis, 37. pubescens. 17, 18, 27. 



aiihiffJia, 20. Fortuiiei, 27. pulcliella, 25. 



bella. 24, Foxli, 29. pumila. 30. 



Bt'thleheiucusis, 45, glabrata, 27. pyramidata, 40. 



47. glabreseens, 19. Jieevcsiana, 15. 



betnlifolia, 35. grandiflora, 43 and Bcgeliana. 41. 



BiUardii, 47. suppl. robiistn, Hi. 



bbanda, 16. hyperieifolia, 2. rosea, 36. 



Blumei, 12, 13. intermedia, 41. rntiuidifolia. U. 21. 



hrachybotrys, 37. Japonica, 27 and ruberrima, 27, 30. 



bracteata, 11. suppl. rui><>stris, 12. 



bnllata, 26. Jap07iica alba, 31. salleifolia. 43, 44, 



Biimalda, 30. Japordca panicu- 4.5. 



Californica, 47. lata, 38. Sanssouciana, 41. 



callosa, 27. Kn.mrionensis, 25. semperflorens, 38. 



caiia. 7. liieviicata, 1. sericea, 19. 



{'anadensis, 4.5. lanceolata, 15, 44. Slbirica, 43. 



eaiiesceiis, 21. latifidia, 45. superha, 32. 



Cantonifiisis, 15, Lemoinei. 30. syring^rtora, 38. 



carnea, 43. Lenneana, 47. thalictroides, 2. 



carfjinifntia, 45. leucantha, 31. Thunbergi, 3. 



cbamtedrj-folia. 20. longigemmis, 23. tnuKMitosa., 49. 



Cliinensi.s, 17. lucida, 34. triloba, 13. 



cocciriea, 24. luxuriosa. 37. triloliata, 13. 



coiifiisa, 19. macrophylla.. 27. triu(ni>baiis, 47. 



coiispii^'ua, 3S. MargaritEe. 28. truiu-ata, 2. 



Ooiistaiiliif^, 47, media, 11, 19. ulmitulia, 20. 



eiu-yinhn.sa, 15, 33. Menxiesi, 46. vacrini folia, 21 and 

 crrifirr/ifiilin, 13, 33. nuiltitiora, 5, suppl. 



ci-enata, 2, 9. Nirmaller/i, 10. Van Hnuffei. 14. 



crenifnlin, 9. Xippniiica, 11. Vivginiana, 34. 

 crispifolia, 26. 



Section 1. Petrophytum (Spcr-ies not in rult.). 

 This section contains a few rather rare American spe- 

 cies of whicli nLan-- is in cultivatiun. The Vjest known 

 is S. ceespitosa, Nutt. (Pefvphytu-yn cefspifosutn, 

 Ryclh.), a dwarf cespiti.se suhshnib, only a few inches 

 hii^h, with crowded, small, entire Ivs. and small, whitish 

 fls. in dense, nsually simple racemes on slender stalks 

 arising from the tufts of the grayish green foliage. It 

 is very unlike any other Spirea and more resembles in 

 habit a Saxifraga. It is perhaps better regarded as a 

 distinct genus like Ihe allied Kelsci/a iinifjbra, Rydb. 

 { Friofiffiiia anifldrn. Wats.), and Eriogijnia pectindla, 

 Plook. 



Set'tion 2. SiBiR^A (Species Ko. 1). 

 1. laevigata, Linn. (N. Altdica, Pall. .Sibirwa hrri- 

 gdlii, Maxim.). Shrub, .^> ft. tiigb, with stout uprii^^ht 

 branches : Ivs. cnneate-oblong, bluish green, glabrous, 

 l/^-3K in. long: tis. ]M)lyfr;imous, greenish white in 

 terminal panicles, 3-.5 in. hmg, those of the staminate 

 plant somewhat showier. Mav. Siberia. — Hardy. 



Section 3. Cham^dryon (Si)ecie 



A. FJs. in sessile umbels, with none 

 or very small Ivs. at the base or 

 onli/ the loiver umbels on leafy 

 sta'lks. 

 B. Foliage entire or crenately den- 

 fate only near the apex, often 



3-nerved, grayish green 2. 



BB. Foliage dentate or ser^'ate, usu- 

 ally 2Jeniiinerved, bright 

 green. 

 c. Shape of Ivs. linear-lanceo- 

 late: glabrous 3. 



cc. Shape of Ivs. ovate to olihmg- 

 layiceolate : finely pubes- 

 cent when young. 

 D. Umbels on the lower part 

 of the branches stalked. 



E. lyvs, oblong 4. 



ee. I/vs. obovate 5. 



DD. Umbels all sessile, S-6-fld. 0. 

 A. Fls. in umbel-like racemes on 

 leafy stalks. 

 B. Margin of Irs. entire or crenate 

 or dentate only toward, the 

 apex. 

 0. Foliage grayish pubescent 



on both sides 7. 



cc. Foliage almost glabroas. 

 D. Shape of Irs. elliptic to 

 oblong -hrnceolate. 

 E. Lvs . p e It n i n e r v e d : 



shoots angular 8. 



EE. IJ-vs. all or partly 

 3-nerved. 

 F. Shoots striped: lvs. 



all S-nerved 9. 



pp. Shoots terete: lvs. 

 pa rt ly pen n in erved , 



partly S-nerved 10. 



DD. Shape of lvs. ahnost or- 

 bicular, y^-l in. broad. .11. 

 BB. Margi^i of lvs. incisely serrate 

 and often slightly lobed (only 

 in j\^o. 19 sometimes entire). 

 C. Stamens shorter than or as 

 long as petals: sepals 

 erect or spreading in fr. 

 D. Foliage glabrous. 



E. Form of Ics. orbicular 

 to ovate. 

 F. Apex of lvs. obtuse. 

 G. L V s . penninerved, 



ovate 12, 



lic. Lvs.palmately 3-5- 



nerved, orbicalar.V.]. 

 pp. Apex of Irs. acute .. .M 

 EE. Form of lvs. rhombic- 

 lanceolate IT), 



DD. Foliage pubescent, at least 

 beneath . 

 E. Umbels and. follicles 

 pubescent. 



F. Tomentum grayish . .}C}. 

 FF. To)nentu}n yellowish. 17. 

 EE. Umbels and follicles 



glabrous 18, 



CC. Statnois longer than petals: 

 sepals reflexed. 

 D. Shoots terete, often, pubes- 

 cent in fruit 19. 



DP. Shoots angular, glahrotis.'lO. 



Nos. 2-20). 



hyperieifolia 



Thunbergi 



arguta 



multiflora 



prunifolia 



alpina 



crenata 



Pikowiensis 

 bracteata 



Blumei 



trilobata 

 Van Houttei 



Cantoniensis 



blauda 

 Chinensis 



pubescens 



media 

 chamse dry folia 



2. hypericif6Ua, Linn. Vigorous .shrub, o ft. high, 

 with sleTider arching or upright branches: lvs. almost 

 sessile, ouneate-obovate to obovate-lanceolate, 3-nerved 

 or with few lateral veins, almost glabrous, H-l^ in- 

 long: fls. small, white, in sessile umbels; pedicels usu- 

 ally pubescent; petals almost orbicular, usually longer 

 than stamens. April, May. S. E. Eu. to Siberia.-Va- 

 riable species. Var. acutif61ia, Wenzig (S. acutifolia, 

 Willd. S. hyperieifolia, var. acuta, Ser.). Lvs. nar- 



