1790 



TEXAS 



iirnl uorthern varieties were found adapted, or profitable. 

 Some of tliese varieties tluit liave originated in tlie 

 st;ite are given in tlie following lists. 



T. V. MUNSON. 



THALIA (J. TUalius, a Grrnuui naturalist, and author 

 of Sylvu T-Torrvniii. u eafaloj^ui' of the plants of tlio 

 Harz mountains; died l.'.SS]. Srihtitiinnei'd- . Ahout 7 

 species of tender American perf.-iniiai, stenib-ss. marsh 



THALICTRUM 



herbs with large, long-petioled, often canna-like leaves 

 and long: scapes bearing large panicles of spikes of usu- 

 ally purple Howers. Fls. commonly 2 together in a 2- 

 vafved spathe; calyx minute; corolla tubular, with 6 

 divisions, of which the 3 interior are unequal; style 

 thick, spiral; stigma 2-lipped, the lower lip long and 

 pendulous: capsule inJiated, 1-Ioculed, 1-seeded. 



A. Plant covered with a white powder. 

 dealba,ta, Pras. Stemless : petioles 1-2 ft. long: Ivs. 

 canna-like, cordate, ovate, 0-9 in. long: scape terete, 

 3-5 ft. higli; panicles erect: spikes erect. June-Sept! 

 Ponds and marshes, S. C. and west. B.M. 1090. B.B. 

 1:45.5.— A fine and stately aquatic when well grown. It 

 should be placed in shallow water or in wet .soil. 



AA. Plant not poivdery. 

 dlvaric&ta, Chapm. Stemless: petioles longer than 

 in T. dcttlhafa: Ivs. banana-like, 1-3 ft. long, oblong- 

 ovate: scape 5-10 ft high: panicles 2-4 ft. wide: spikes 

 zigzag, pendulous. Sept., Oct. Ponds, Apalachicola, 

 Fla.— According to Reasoner Bros., this magnificent 

 native ornamental-leaved marsh plant thrives in garden 

 soil with cannas and like plants. Does well under culti- 

 vation in southern California. p_ -^^^ B vrclay 



THALfCTRUM {ultimately probably derived from 

 Greek fhailo, to grow, but application doubtful). Bu- 

 nuucnliiccai. Meadow Rue. Erect perennial herbs: 

 Ivs. ternately compound and decompound ; stem-lvs. 

 alternate : fls. dioecious, polygamous, or perfect in 

 some sjjecies, rather small, generally greenish white 

 or sometimes purple or yellow, borne in a panicle or 

 loose raceme; sepals 4 or 5, deciduous; petals want- 

 ing; stamens many, showy: carpels usually few, 1- 

 seeded. This group includes several forms which are 

 well suited for the mixed border and rock garden. The 

 robust forms are desirable for the wild garden. Many 

 are very hardy, and only the more sotithern forms of 

 those given below are at all tender. Thalictrums are 

 valued for their feathery heads of flowers, contrasting 

 with their handsome stems and leaves, which are often 

 of a purple cast. They may be propagated by seed or 

 by division of roots in early spring, just as growth he- 

 gins. Any good loamy soil will suit them if well 

 drained. 



The latest monograph of the entire genus was pub- 

 lished in 1885, by Lecoyer, in Bull. Soc. Roy. de Bot. 

 de Beige, where he describes 09 species. In 1886 Wm. 

 Trelease published a fine treatment of "North American 

 Species of Thalictrum " in Proc. Soc. Bost. Nat. Hist. 

 23:293-304, in which he recognized 11 species and 4 

 varieties north of Mexico. His treatment is rather 

 c]os(dy folb>wed by Robinson in Gray's Syn. Flora, 1895. 

 Since that time at least 10 new species have been de 

 scribed — chiefly from Mexico— several of which are by 

 J. N. Rose, in'Cont. U. S. Natl. Herb. 5:185, Oct. 31, 

 1699. All North American forms were treated by the 

 present writer in Minn. Bot. Studies. Aug.. 1900. Be- 

 sides several native species, about 5 have been intro- 

 duced to our gardens from other countries. 



INDKX. 



adiantifolium, 3. Fendleri, T2. purpnrascens, 'T,. 



adiantoides, 3. glauenm, 4. purj>vrfinn, :.i, 5. 



aquilegifolinm, 7. minus, )!. saxatilc '■'•. 



Chelidonii, lu. occidentale, 11. sparsitlonnn, 2. 



Connitl. 7. petaloidcum, 1. speciosuin, i. 



Dehivjiyi, PI, pnlyearpuni, VA. venulosum, 9. 



dioicum, 8. pob'gauium, (i. 



A. Pis. perfect. 



P.. Pihoiieiifs If id e lied near the 

 anthers: anthers i>r(i1c,ob- 

 tase. 

 <■. A'kene_s sessile, in a head, 



ovate-oiiloiKj 1. petaloideum 



CO. Alcoies stalked, le i d e I }/ 

 spreiidi n<i, straii/ht alone/ 



dorsal nnnr/in .' '. 2. spaisiflorum 



BB. Filanienis fHli'orni : a)ithers 



linear, aenie or ni iicronate . 



r. Fruits sii leiitr : stl(inia di- 



lat<'d on one shle of the 



slnn-t stifh 3. minus 



