5IO 



APPENDIX. 



[Vol.. III. 



[Vol. I: p. 367.] 2a. 



9 9 



5^ 



Wolffia papulifera Thompson. 

 (Fig. 891a.) 



Pointed Duckweed. 



^='^t^ 



Wolffia papulifera Thompson, Ann. Rep. Mo. Bot. 

 Gard. 9: 20. pi. 4D. 1897. 



Thallus slightly unsymmetrical, obliquely 

 broadly ovate, about yi" broad, the apex 

 rounded, the upper surface Jlat at the marghiy 

 >;radually ascending into a prominent conic 

 papule on the median line, brown-punctate, the 

 under surface strongly gibbous, less punctate; 

 stouiata numerous on the upper surface; flower 

 and fruit unknown. 



Floatinfr. with the entile upper surface exposed 

 to the air, Kennett and Columbia, Mo. 



[Vol. i: p. 377.] 



la. Tradescantia bracteata Small. Long-bracted 



Spiderwort. (Fig. 910a.) 



Perennial, deep green, glabrous to the inflorescence, 

 or nearly so. Stems erect, 4''-lo' tall, simple or spar- 

 ingly branched; leaves linear to linear-lanceolate, 4'- 

 8' long, long-acuminate; sheaths paler than the leaf- 

 blades, conspicuously ribbed, glabrous, or the upper 

 ones sometimes ciliate; involucres 0/2 bracts, these 

 brooder than the leaves, more or less strougl5' saccate 

 at the base, ciliate and often sparingly villous on the 

 back; umbel-like cymes few-flowered; pedicels glan- 

 dular-pubescent, yi'-l' long; sepals ovate-lanceolate to 

 clliptie-lanecolate, glandular, more or less involute; 

 corolla blue or reddish, about l' broad. 



In sandy soil, Minnesota to South Dakota, south to 

 Kansas. Spring and summer. Ascends to 7500 feet in 

 the Black Hills. 



[Vol. I: p. 377.] 2a. Tradescantia 



reflexa Raf. Reflexed Spiderwort. 



(Fig. 911a.) 



Tradescantia reflexa Raf. Atl. Joum. 150. 1832. 



Perennial, glabrous, i^/<(Hf£>«s. Stems erect, 

 :°-3= tall, nearly straight, commonly much 

 branched; leaves linear, S'-2o' long, straight, 

 or somewhat curved, long-attenuate; sheaths 

 large, 5"-l5" long; involucres of 2 unequal 

 jinally rejlexcd leaf-like bracts; umbel-like 

 cymes usually dense at maturity; pedicels 

 slender, io"-i3" long, recurved ; sepals ob- 

 long or elliptic, apparently lanceolate by the 

 involute edges, 4"-5" long, hooded, mostly 



-.vith a tuft of hairs at the apex ; corolla blue or red, lo"-l5" broad, the f'ctals suborbicularl 



capsule ovoid to oblong, ly/'-^" long, glabrous. 



In sandy or clayey soil, Minnesota to Florida and Texas. Spring and summer. 



