5io 

 [Vol. i: 



9 9 

 8^ 



APPENDIX. 



367.] 2a. Wolffia papulifera Thompson. 



(Fig. 891a.) 



[Vol. III. 

 Pointed Duckweed. 



-o=<5^" 



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

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



Thallus slightly unsymmetrical, obliquely 

 broadly ovate, about y z " broad, the apex 

 rounded, the upper surface flat at the margin, 

 gradually ascending into a prominent conic 

 papule on the median line, brown-punctate, the 

 under surface strongly gibbous, less punctate; 

 stomata numerous on the upper surface; flower 

 and fruit unknown. 



Floating, with the entile upper surface exposed 

 to the air, Kennett and Columbia, Mo. 



[Vol. 1: p. 377-1 



ia. Tradescantia bracteata Small. 

 Spiderwort. (Fig. 910a.) 



Long-bracted 



Perennial, deep green, glabrous to the inflorescence, 

 or nearly so. Stems erect, 4 / -io / 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 of 2 bracts, these 

 broader than the leaves, more or less strongly 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 

 elliptic-lanceolate, glandular, more or less involute; 

 corolla blue or reddish, about 1/ broad. 



In sandy soil, Minnesota to South Dakota, south to 

 Kansas. Spring and summer. Ascends to 7500 feet in 

 the Black Hills. 



[Vol. 1: p. 377.] 2a. Tradescantia 



reflexa Raf. Reflexed Spiderwort. 



(Fig. 911a.) 



Tradescantia reflexa Raf. Atl. Journ. 150. 1832. 



Perennial, glabrous, glaucous. Stems erect, 

 i-3 tall, nearly straight, commonly much 

 branched; leaves linear, S'-ao'long, straight, 

 or somewhat curved, long-attenuate; sheaths 

 large, 5 // -i5 // long; involucres of 2 unequal 

 finally refiexed 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 



with a tuft of hairs at the apex ; corolla blue or red, \o' f -\$" broad, the petals suborbicular ; 



capsule ovoid to oblong, 2^ // -3 // long, glabrous. 



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



