154 CALIFORNIA ACADEMY OF SCIENCES. 



cauliue leaves lanceolate, entire, sparingly ciliate-toothed, 

 on jointed petioles of equal length, lacerate-fringed near the 

 base; upper, reduced to sessile laciniate bracts: heads pedi- 

 cellate, oblong, ^ — J inch in diameter, blue: involucre of 

 8 — 10, narrow bracts, exceeding the head, sparingly toothed 

 and reflexed: calyx-segments subulate, canaliculate, twice as 

 long as the petals and equaling the styles: corolla bluish: 

 seeds but little longer than broad, covered with short and 

 rather soft apiculate scales, becoming ferruginous brown. — 

 Suisun Marsh, Aug. 1833; Dr. Harkness. 



Veiy distinct from any form of E. petiolatum; not rigid, 

 and only the bracts of the head prickly. 



Nemacladus rigidus. Slightly pubescent, prostrate and 

 branching only at the base: branches stout and rather rigid, 

 zigzag, 2 — 1 inches long: leaves thick, entire, spatulate-lan- 

 ceolate: pedicels 3 — 8 lines long: calyx gibbous; teeth irregu- 

 lar: corolla purple, shorter than the calyx-lobes; petals 

 separate: stamineal tube very short: capsule globular in- 

 cluded in the calyx: seeds oval, reddish, longitudinally- 

 striate. — Geiger Grade, near Virginia City, Nevada, July. 

 The stoutest of the genus. Whole plant purplish. 



Trichostema ovatum. Villous-pubescent, 1 — 2 feet high, 

 branching from the base, branches ascending, virgate, leafy: 

 leaves short-ovate, mucrouate, very shortly petiolate, about 

 as long as the internodes, lower surface ribbed by 3-6 strong 

 nerves which follow the outline of the leaf and terminate 

 before reaching the margin: cymes shortly peduucled: 

 calyx densely villous: tube of the corolla slender about 

 three lines long, twice the length of the calyx; lobes villous 

 externally: stamens 6 — 3 lines longer than the corolla: seeds 

 tuberculate, spatulate-obovate in outline, densely villous. — 

 Bakersfield, July, 1831. Readily distinguished from T. 

 lanceolatum, by its very small flowers and nearly round 

 leaves. 



