712 HELIOTROPACEAE 



tip. Ovary 4-celled or 2-celled, with 2 more or less intruding placentae; ovules 

 pendulous. Fruit 4-lobed or 4-grooved, sometimes didymous, but separating 

 into 4 nutlets. 



1. H. spathulatum Rydb. A glabrous, more or less glaucous, fleshy per- 

 ennial, 3-5 dm. high; leaves spatulate, fleshy, indistinctly nerved, 2-5 cm. long, 

 obtuse or rounded at the apex; inflorescence branched into 2-5 racemes, these 

 often starting from one point at the end of the common peduncle; corolla white 

 or slightly tinged with blue, 6-8 mm. long; nutlets 2.5-3 mm. long, scarcely rugose. 

 H. curassavicum Hook., not L. H. curassavicum ohoralum DC, not H. ohovatum 

 D.Don. River valleys: Sask. — N.M. — Calif. — Wash. Plain. 



2. EtJPLOCA Nutt. 



Annual caulescent herbs. Leaves alternate, broad, entire, petioled, pubes- 

 cent. Flowers perfect, regular, sohtary in the axils of leaf-like bracts. Calyx- 

 lobes 5, narrow. Corolla salver-shaped; tube cylindric, naked in the throat; 

 hmb 5-angled, strongly plicate in aestivation. Stamens 5, included; anthers sub- 

 sessile, with a beard at their base; ovary 4-celled; style elongate; cone of stigma 

 penicUlate-setose; oAiiles pendulous. Fruit didj-mous, the two halves separating 

 into 2 hemispheric, 1-seeded nutlets. 



1. E. convolvulacea Xutt. Diffusely branched annual; stem 1-4 dm. 

 high, hispid-strigose; leaf -blades lanceolate or ovate, 2-4 cm. long, hirsute-stri- 

 gose; flowers usually supra-axillary; calyx-lobes hnear-subulate ; corolla white, 

 salver-shaped to funnelform. 10-15 mm. long; nutlets almost hemispheric, 3 

 mm. broad, more or less strigose. Heliotropium convohmlaceum A. Gray. Sandy 

 plains: Tex. — Neb.^ — Wyo. — CaUf.; Mex. Plain — Son. My-Au. 



F.\MiLY 113. BORAGINACEAE. Borage Family. 



Herbs (all ours), or shrubby plants. Leaves alternate, without stipules, 

 simple, entire, bristly. Flowers perfect, regular, or sometimes irregular, in 

 scorpioid racemes or spikes. Calyx of 5, rarely 4, more or less united sepals, 

 persistent. Corolla salver-shaped or campanulate, rarely nearly rotate, 

 deciduous; throat often with a crown of 5 small scales (fornices); lobes 5, 

 convolute, plicate or induplicate, usually ecjual. Stamens 5, adnate to the 

 corolla-tube; filaments often appendaged; anthers introrse. Gynoecium of 

 2 united carpels; styles united, rising between the four lobes of the ovary; 

 stigma simple or 2-lobed; ovules anatropous, solitary in each cell of the 

 ovary. Fruit usually of 4 nutlets. 



Nutlets with hooked prickles, at least on the margins. 

 Nutlets spreadtag or divergent on the low receptacle. 



Nutlets elongate, flat, wing-margined, attached imderneath the edge of the recep- 

 tacle; prickles only on the margins; slender annuals. 

 Nutlets divergent in pairs; margin laciniate or undulate. 1. Pectoc.^RTA. 

 Nutlets equally radiately divergent, entire- margined. 2. Gruveli.\. 



Nutlets short, not wing-margined, prickly all over, attached horizontally or 

 obliquely on the receptacle; stout biennials or perennials. 3. CyNOGLOSSUM. 

 Nutlets erect on the elevated receptacle, prickly on the margin, rarely along the 

 back. 4. L.\PPCL.\. 



Nutlets unarmed, or if prickly the prickles not hooked. 

 Receptacle conic or elongate; nutlets attached laterally. 



Calyx in fruit much enlarged, veiny-reticulate and folded. 5. Asperugo. 

 Calyx in fruit neither much enlarged, nor conspicuously veiny. 



Corolla blue or white (yellowish only in a few species of Oreocarya), with 

 fornicles in the throat (e.\cept in Greeneocharis, and obscurely so in 

 Eremocarya): cotvledons entire. 

 Nutlets attached below the middle, with an oblique truncate back, wliich 

 is surrounded by an entire or toothed margin; low pulvinate-cespitose 

 pereimials. 6. Eritrkhrtm. 



Nutlets attached at the middle or with an elongated scar reaching from 

 the base to above the middle, not with a truncate, margined back; 

 plants rarely pulvinate-cespitose. 

 Pedicels and caly.x persistent in fruit. 



Calyx circumscLssile ; plants dichotomously branched. 



7. Greeneocharis. 



