Water Pygmyweed

Tillaeastrum aquaticum
Add to the illustrations: Britt. & Brown, 111. Fl. ed. 2, /. 2131; G.T. Stevens, 111. Guide pi. 59, f. 5.
10. Insert:
4a. Tillaeastrum longipes Rose, Contr. U. S. Nat. Herb. 13: 301. 1911.
Stems simple, erect, about 2 cm. high. Leaves linear, acute, 1 mm. broad or less;
peduncles slender, filiform, weak, 2-4 mm. long, sometimes much longer than the leaves;
sepals green, about half as long as the petals; seeds several, oblong in outline, smooth.
Type locality: Near Trinidad, Hidalgo. Distribution: Known only from the type locality.

Tillaeastrum aquaticum (I^.) Britton, Bull. N. Y
Bot. Gard. 3:1. 1903.
Tillaea aquatica L. Sp. PI. 128. 1753.
Tillaea simplex Nutt. Jour. Acad. Phila. 1 : 114. 1817.
Tillaea ascendens Eaton, Man. ed. 2. 465. 1818.
Bulliarda aquatica DC. Prodr. 3 : 382. 1828.
Tillaea angustifolia Nutt.; T. & G. Fl. N. Am. 1 : 558. 1840.
Tillaea angustifolia Bolanderi S. Wats. Bot. Calif. 1 : 209. 1876.
Tillaea Bolanderi Greeue, Fl. Fran. 183. 1891,
Crassula aquatica Schoenl. in E. & P. Nat. Pfl, S^o; 37. 1891.
Stems 1-8 cm. high. Leaves linear-oblong, entire, connate at the base, 4-6 mm. long: flowers solitary, axillary, sessile or short-peduncled, 1 mm. broad : cal5rx-lobes, petals, stamens and carpels 4, rarely 3 ; petals greenish, about twice the length of the calyx-segments ; follicles ovoid, longer than the cal3rx-lobes, 8-10-seeded.
Type locality : Inundated places, Europe.
Distribution : In mud. Nova Scotia to Maryland, Louisiana and Texas, Washington to Lower California and Colorado. Europe to northern Africa.