550 BORAGINACEAE 



tinguished from the typical species by having the marginal prickles confluent at least to about the middle, 

 forming a cup-like margin. Southeastern Washington southward east of the Cascade-Sierra Divide to the 

 deserts of southern California, eastward to Montana, Wyoming, and New Mexico. Type locality: "Dry plains, 

 along the eastern side of the Sierra Nevada (Watson, etc.)." Watson's specimens, which Western botanists 

 generally have taken as the type, were from the Trinity Mountains, Nevada. 



14. HACKELIA* Opiz in Bercht. Oekon. Fl. Bohm. 2 : 146. 1838. 



Biennial or perennial usually rather tall herbs with linear or oblong leaves. In- 

 florescence naked or bracteate at the branches of the panicle; pedicels recurved or de- 

 flexed in fruit. Calyx 5-parted, spreading or reflexed in fruit. Corolla blue, pinkish or 

 vi^hite, the throat prominently crested. Style shorter than the nutlets. Nutlets beset with 

 glochidiate bristles, attached below the middle to the broadly pyramidal gynobase by a 

 large, oblique, ovate or deltoid areola, ventral keel extending over only upper half of 

 nutlet. [Named in honor of P. Hackel, a German professor of agriculture.] 



A genus of about 35 species, of wide geographical distribution, but mostly in the north temperate regions. 

 Type species, Hackelia deflexa Opiz. 



Racemes several to many, paniculately disposed, bracteate. 



Annuals; mature nutlets 2-3.5 mm. long. 1. H. deflexa americana. 



Perennials; mature nutlets 4-8 mm. long. 



Dorsal surface of the nutlet without barbed prickles or bearing few to several, these shorter than the 

 marginal ones which are flattened at the base and form a conspicuous border to the nutlet. 

 Marginal prickles distinct or united only at the base. 

 Corolla 5-7 mm. broad. 



Branches of inflorescence rather strict, numerous, many-flowered; plants 5-10 dm. high, 

 rather coarse. 2. H. floribunda. 



Branches of the inflorescence open, spreading, with fewer branches and flowers; plants 

 3-6 dm. high. 



Nutlets broadly ovate; basal leaves few, stems leafy above, the leaves not conspicu- 

 ously reduced in size. 3. H. Jessicae. 



Nutlets narrowly ovate; basal leaves many, stem-leaves few, reduced in size. 



4. H. Cusickii. 

 Corolla 8-18 mm. broad (sometimes less in aridd). 



Corolla blue. 



Herbage short-toraentose, mostly appressed; corolla 8-10 mm. broad. 



5. H. atncthystina. 

 Herbage bristly hirsute; corolla 12-15 mm. broad. 6. H. setosa. 



Corolla white (sometimes pale blue in diffusa). 

 Leaves oblanceolate to ovate-lanceolate. 



Corolla 8-12 mm. broad; herbage soft-hirsute. 7. H. diffusa. 



Corolla 12-18 mm. broad; herbage strigillose-tomentose. 



8. H. bella. 

 Leaves linear-lanceolate to linear. 9. H. arida. 



Marginal prickles united one-third to one-half their length, usually rolled inward to form a cup- 

 like margin to the nutlet. 



Corolla large, 12-20 mm. broad. 



Herbage strigose-pubescent with intermingling spreading hairs; leaves linear to linear- 

 lanceolate; flowers blue. 10. H. ciliata. 

 Herbage hispid; leaves oblong-spatulate to oblanceolate; flowers white. 



11. H. venusta. 

 Corolla small, 4-10 mm. broad, white. 



Corolla-appendages hairy; pedicels longer than the mature fruit. 



12. H. cxnerea. 



Corolla-appendages smooth; pedicels equaling or shorter than the mature fruit. 



13. //. hispida. 



Dorsal surface of the nutlet evenly beset with barbed prickles, these not strongly flattened to form a 

 conspicuous border to the nutlet. 

 Corolla rotate; corolla-tube not or but little exceeding the calyx. 



Corolla 6-10 mm. broad, white; prickles stout, up to 2.5 mm. long; surface of the nutlet dull, 

 conspicuously muriculate. 14. H. calif ornica. 



Corolla 12-18 mm. broad, pink fading blue; prickles slender, up to 5 mm. long; surface of 

 the nutlet shining, smooth. 15. H. munduta. 



Corolla short-salverform, the tube well surpassing the calyx. 



Corolla 12-20 mm. broad; corolla-appendages large, about one-third as long as the corolla-lobes, 



pubescence velvety. 16. H. velutina. 



Corolla 6-8 mm. broad, about one-sixth as long as the corolla-lobes, pubescence not velvety. 



17. H. nervosa. 



Racemes 1-3, terminal, umbel-like, not bracteate. 18. H. Sharsmithii. 



1. Hackelia deflexa var. americana (A. Gray) Fernald & Jtn. 

 Nodding Stickseed. Fig. 4202. 



Echinospermum deflexum var. americanunt A. Gray, Proc. Amer. Acad. 17: 244. 1882. 



Lappula deflexa var. americana Greene, Pittonia 2: 183. 1891. 



Lappula americana Rydb. Bull. Torrey Club 24: 294. 1897. 



Hackelia deflexa var. americana Fernald & Jtn. Rhodora 26: 124. 1924. 



Slender-Stemmed annual 6-10 dm. high, herbage green, the rough, sparse puberulence spread- 

 ing or appressed, hairs somewhat enlarged at base. Leaves oblong-lanceolate to lanceolate, 

 petioled, 6-10 cm. long, length of petiole reduced on the upper leaves, these becoming sessile; 



Text contributed by Roxana Stinchfield Ferris. 



