1700 



SPIR^A 



KEY TO THE SECTIONS. 



A. Lvs. always entire: fls. m simple or panicled 

 racemes: follicles usually ^-seeded. {Bo- 

 try ospira, Zabel.) 

 B. Plants tufted, suffniticose: fli. perfect, in 

 usuaUy iimple racemes 

 SectiiinI I'}- ru<>pH\ II >i ■-■ i Mii.-ult.) 



BB. Plant (III tiju niht chilli, ,1 

 fts. piihl</.n„ ./,s III p.i, 



.St(lIi..S _'. MBn..LMfe|"^lL^ ^"• 1) 



AA. lAis. tisually serrate, raitly tntiiL. fls. in 

 umbel-like racemes, corymbs or panicles: 

 seeds several. 

 B. Inflorescence a simple umbel-like raceme: 



fls. white 



Section 3. Cham^dkyon (Species Nos. 2-20) 

 BB. Inflorescence compound: fls wliite or pink. 



C. Fls. in corymbs 



Section 4. Calospiba (Species Nos. 21-36) 



CO. Fls. in panicles 



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



INDEX. 



acuta, 2. cuneata. 21. Nobleana, 42. 



acutifolia. 2. mneifolix, 21. notha, 39. 



adiantitolia, 13. decumbens, 22. noea, 16. 



alba, 37, 44. densiflora. 36. oblongifolia, 19. 



albiflora, 31. Douglasl, 48. obovata, 2. 



alpina. 8. eximia, 47. ovata, 24. 



AUaica, 1. expansa, 25. pachystachys, 42. 



aquilegifolia, 13. iiabellata, 2. paniculata, 38, 44. 



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



arpentea, 21. flagelHformis. 21. procumhens, 22. 



arguta, 4. flexuosa, 20. pruinosa, 37. 



atritolia, 20. Fontenaysii, 37. pi-uuifolia, 6. 



atrosanguinea, 27. Fontanaysiensis.Zl. puheseeus. 17, 18,27. 



aubifolia, 20. Fortune!, 27. pulchella, 25. 



bella, 24. Foxii, 29. pumila, 30. 



Bethlehemensis. 45, glabrata, 27. pyramidata, 40. 



47. glabrescens, 19. Beevesiana, 15. 



betulifolia, 35. grandiflora, 43 and Begeliana, 41. 



Billardii, 47. suppl. robusta, 16. 



blanda, 16. hypericitolia, 2. rosea, 36. 



Blumei, 12, 13. intermedia, 41. rot\iiidUolia.\\.21. 



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



bracteata, 11. suppl. rupestris, 12. 



bullata, 26. Japonica alba, 31. salicifolia, 43. 44, 



Bumalda, 30. Japonica panicu- 45. 



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



callosa, 27. Kumaonensia, 25. semperflorens, 38. 



cana. 7. laevigata, 1. sericea, 19. 



Canadensis, 45. lanceolata, 15, 44. Sibirica, 43. 



canesceus, 21. latifolia, 45. superba, 32. 



Cantoniensis, 15. Lemoinei, 30. syringasflora, 38. 



camea, 43. Lenneana, 47. thalictroides. 2. 



carpinifolia, 45. leucantha, 31. Thunbergii, 3. 



chamaediTfolia, 20. longigemmis, 23. tomentosa, 49. 



Chinensis, 17. lucida, 34. triloba, 13. 



coccinea, 24. luxuriosa, 37. trilobata, 13. 



confusa, 19. maerophylla, 27. triumplians, 47. 



conspicua, 38. Margaritse. 28. truncata. 2. 



ConstantisB, 47. media, 11, 19. ulmifolia. 20. 



corymbosa, 15, 33. Menziesi, 46. vaccinifolia, 21 and 



cratwgifoUa, 13, 33. multiflora, 5. suppl. 



crenata. 2, 9. Nicoudierti, 10. Van Houttei, 14. 



crenitolia, 9. Nipponica, 11. Virginiana, 34. 

 crispifolia, 26. 



Section 1. Petkophytum (Species not m cult ) 

 This section contains a few rather rare American spe 



St known 



db 



! of which 

 is S cseapitdsa, Nutt 

 Rydl) ), a dwaif cespit 

 high, with crowded, sill, I 

 fls m dense, usiuilh s,, 

 arising from the tufts . t 

 is verj unlilce anj othi i ^ i 

 habit a Saxifraga It i 

 distinct genus hke th* 

 {.EringiiHia unifld)a,\\ ,i 

 Hook 



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

 1. laevigata, Linn. {S. AltAica, Pall. Sibirma Imvi- 

 gita, Maxim.). Shrub, .5 ft. high, with stout upright 

 branches : Its. cuneate-oblong, bluish green, glabrous, 

 1K-3H in. long: fls. polygamous, greenish white in 

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

 plant somewhat showier. May. Siberia. -Hardy. 



SPIR^A 

 Section 3. Cham^dryon (Species Nos. 2-20). 

 A. Fls. in sessile umbels, with none 

 or very small lvs. at the base or 

 only the lower umbels on leafy 

 stalks. 

 E. Fnli,i,jf,iiliiv,>i-,i: „„t,hi ,1,11- 



::-„, ,r, ,1. ,,,;t„,si, ,,,;,„ 2. hyperlcifolia 



BE. F,jli, ,,/,■, I, lit, ite „r s, init,\ ii.iu- 

 •Illy jieiuciiieri-ed, bright 

 green. 

 c. Shape of lvs. linear-lanceo- 

 late: glabrous 3. Thunbergi 



CC. Shape of lvs. ovate to oblong- 

 lanceolate : finely pubes- 

 cent when young. 

 D. Umbels on the lower part 

 of the branches stalked. 



e. Jjvs. oblong 4. argnta 



EE. Lvs. obovate 5. multiflora 



DD. Umbels all sessile, S-G-fhl. C. prunifolia 

 aa. Fls. in umbel-like racemes on 

 leafy stalks. 

 B. Margin of lvs. entire or crenate 

 or dentate only toward the 



c. Foliage grayish puhesrenf 



on both ii),J,s 7. cana 



CO. Foliage iilii,,-st ,il„},r,,,,s. 



T>. Shape ,'f h-s. . l/ij'li,' /,, 

 Oblong-hiii,;.,l,il,:. 

 E. Lrvs. penninerved: 



shoots angular 8. alpina 



EE. Ijvs. all or partly 

 S-nerved. 

 p. Sh,„-jts sti-!p,d: Irs. 



all .:-,!, r,;, I 9. crenata 



FF. Sh,„.ls l.r.t. : I ,■ s . 



I, I hi 



DD. Sha 



bi 



Margin 



10. Pikowiensis 



11. bracteata 



0. Foliage glabrous. 

 E. Form of lvs. orbicular 

 to ovate. 

 F. Apex of lvs. obtuse, 

 a. Lvs. p,nn!n,:n;'d. 



Blumei 



i,,ri;,i.„ii.i,„l„r.U. trilobata 

 FF. Apex of lis. ucuh...u. Van Houttei 

 EE. Form of lvs. rhombic- 

 lanceolate 15. Cantoniensis 



DD. Foliagepubescent,atleast 

 beneath. 

 E. Umbels and follicles 

 pubescent. 



F. Tomentum grayish.. \li. blanda 

 FP. Tomentumyellowish. 17. Chinensis 

 EE. Umbels and follicles 



glabrous 18. pubescens 



c. Stamens longer than petals: 

 sepals reflexed. 

 D. Shoots terete, often pubes- 

 cent in fruit 19. media 



DD. Shoots angular, glabrous. 20. chamaedryfolia 



2. hypericifolia, Linn. Vi;,'<irnns shrub, 5 ft. high, 

 with >liMi.U'i- nrrhinu- di- upvi-lit 1. ranches: lvs. almost 

 si-s,il,.. (•ni[.-:ii.--..l...\;iti- I.. ..li'ivat. -lanceolate, 3-nerved 

 or witli I'lW kit,i:il v.-iii>. almost glabrous, %-\]4 in. 

 loLg: lis. small, white, ill .se.s.sile umbels; pedicels usu- 

 ally pubescent; petals almost orbicular, usually longer 

 than stamens. April, May. S. E. Eu. to Siberia. — \'a- 

 riable species. Var. acuti'ldlia, Wenzig [S. acutifdlia, 

 Willd. S . hypericifdlia , var. acu,ta, Ser.), Lvs. nar- 



