BORAGE FAMILY 715 



Back of the nutlets without prickles, almost smooth. 



Stem-leaves lineai -lanceolate, densely strigose. 12. L. angustata. 



Stera-lciives oblong-lanceolate, hispidulous, the hairs with papillose bases. 



13. L. scaberrima. 

 Inflorescence leafy, the floral leaves, although smaller, resembling those of the stem; 



annuals. 

 The annular margin connecting the bases of the prickles inconspicuous in all four 

 nutlets. 

 Marginal prickles in two rows. 



Corolla almost 3 mm. wide; prickles shorter than the length of the fruit. 



14. L. erecta. 

 Corolla less than 2 mm. wide; prickles nearly as long as the fruit. 



Fruit 4-5 mm. long; sepals ovate-lanceolate, obtuse; floral leaves ample, 

 ovate or oblong. 15. L. ccnchrusoides. 



Fruit 3^ mm. long; sepals lanceolate or linear-lanceolate, acute; floral 

 leaves much reduced, lanceolate. 16. L. Frcmontii. 



^larginal prickles in one row. 



Calv.\-lobes more than twice as long as the fruit, reflexed-spreading ; floral 



leaves broadly lanceolate. 17. L. calycosa. 



Calyx-lobes less than t^vice as long as the fruit; floral leaves linear or linear- 

 lanceolate. 

 Dorsal faces of the nutlets inside the annular margin smaU; lower prickles 

 inserted about one-third the distance from the base; stem strigose. 



18. L. montana. 

 Dorsal faces of the nutlets inside the ring large; lower prickles inserted 

 near the base of the nutlets; stem Mrsute. 

 Prickles terete; plant green; corolla blue. 19. L. occidentalis. 



Prickles flattened and dilated at the base; plant whitish long-hairy 

 below; corolla wliite. 20. L. leucatricha. 



The annular margin connecting the bases of the prickles at least in three of the nut- 

 lets broadened and forming a cup. 

 Plant at flowering time with a large basal rosette of spatulate leaves ; stems simple 

 up to the inflorescence, softly pilose. 

 Stems several from the rosette, low, 1-2 dm. high; cup deep and much inflated. 



21. L. collina. 

 Stems solitary, 3—4 dm. high; cup rather shallow and sUghtly gibbous. 



22. L. cupulaia. 

 Plant at flowering time without a basal rosette, diffusely branched, hirsute, green. 



Cup deep, more or less saccate. 23. L. helerosperma. 



Cup shallow, with revolute margins. 24. L. foliosa. 



1. L. americana (A. Gray) Rydb. Biennial; stem 3-10 dm. high, retrorsely 

 hirsute; lower leaves petioled; blades oblanceolate, acute, 5-10 cm. long, spar- 

 ingly hirsute, thin; upper leaves sessile, lanceolate, acute or acuminate; corolla 

 pale blue, 1.5-2 mm. wide; back of the fruit convexed, but not keeled, muricate. 

 E. deflexum americanum A. Gray. Copses: Man. — Neb. — Ida. — B.C. Plain — 

 Submont. Je-Jl. 



2. L. leptophylla Rydb. Biennial or perhaps perennial; stem 6-8 dm. 

 high, fineh' retrorsely hirsutulous; basal leaf-blades oblanceolate, very thin, finely 

 pubescent, somewhat scabrous; corolla blue, 2-3 mm. in diameter; back of the 

 fruit finely puberulent, sUghtly muricate, not prickly. Shaded lowlands: Mont. 

 — Wyo. Submont. 



3. L. Besseyi Rydb. Biennial; stem 5-10 dm. high, hirsute, branched 

 above; lower leaf-blades spatulate or oblanceolate, obtuse, hispidulous and hir- 

 sute on the veins; corolla dark blue, scarcely over 1.5 mm. wide; back of the fruit 

 flat, prickleless, but minutely hispidulous. Canons: Colo. Submont. — Mont. 



4. L. floribunda (Lehm.) Greene. Biennial or perhaps perennial; stem 3-15 

 dm. high, strigose or pilose; lower leaf-blades narrowly oblanceolate, 5-15 cm. 

 long, strigose; upper leaves linear or linear-lanceolate, sessile; nutlets 5-6 mm. 

 broad; back slightly ridged, glabrous or scabrous, miiricate. E. floribundum 

 Lehm. Hillsides and among bushes: Man. — N.M. — Calif. — B.C. Plain — Mont. 

 Je-Au. 



5. L. diffusa (Lehm.) Greene. Perennial; stem erect, pilose or softly hir- 

 sute, 5-10 dm. high; basal leaf-blades narrowly oblanceolate, 5-15 cm. long, pilose; 

 fruit 6-7 mm. wide; back flat, hispidulous, somewhat muricate and with a few 

 central prickles. Echinospermum dijfusum Lehm. Brook banks: Alta. — Wyo. 

 —Utah— Calif.— B.C. Submont.— Mont. My-Jl. 



6. L. gracilenta Eastw. Biennial; stem 4-6 dm. high, hispid throughout; 

 basal leaf -blades spatulate or oblanceolate, 2-8 cm. long, hirsute; stem-leaves 



