90 CRUCIFERAE 



Tax. note. — Lauromay Tinsloy, a student in our laboratory, finds the sepals united at base. 

 If Uiis be u constant character it will assist in distinguishing the closely allied L. acutidcns. 



Locs. — Klk Grove, Sacramento Co., Drew ; Vacavillc, Jepson 537a; Vallejo (Bot. Cal. 1:46) ; 

 Oakland. Michcnrr 4' Bioletti; Alviso, liioletti ; Livcrmore, Greene; Bolsa, near Hollister, Jcpson 

 16,113; Cholame Valley, se. Monterey Co., Jcpson 16,182. 



Kefs. — Letidium OXYCARPUM T. & G. Fl. 1:116 (1838), type from California, Douglas; 

 Jepson, Fl. W. Mid. Cal. 228 (1901), ed. 2, 193 (1911), Man. 440, fig. 430 (1925). 



Hymenophysa C. A. Mey. Perennial lierbs with undivided leaves. Flowers 

 wliilo. Pod.s subglobose, bladdery-inflated, tardily or scarcely dehiscent; parti- 

 tions thin or interrupted; seeds 1 to 4 in each cell. H. pubescens C. A. Mey.; 

 Ledeb. Fl. Alt. 3 :181 (1831). Stems erect or ascending, % to 2 feet high simple 

 below, branching above and forming a corymbose panicle of dense racemes; herb- 

 age puberulent; leaves oblong, subentire or denticulate, sessile, all except the low- 

 est auriculate, % to 3 inches long; pedicels mostly ascending; flowers 1 line long; 

 pods somewhat globose-inflated, elliptic in outline, pubescent, 2 to 21/4 lines long. — 

 Native of Asia, sparingly naturalized : Tiger Inn, e. Yolo Co., H. P. Bellue in 

 1932; Los Angeles, T. W. Minthorn 5 in 1910. May- June. The plant has the 

 general aspect of Lepidium draba, especially in habit and inflorescence. 



27. SUBULARIA L. Awlwort 



Small aquatic perennials. Stem simple, scape-like, with a cluster of linear- 

 subulate leaves at ba.se. Flowers minute, white, loosely racemose. Stamens 6, 

 scarcely unequal; anthers oval. Stigma sessile, slightly 2-lobed. Pod elliptic or 

 obovate, scarcely flattened, the valves convex, 1-ribbed on the back. Seeds few, 

 in 2 rows in each cell. — Species 2, the following and a second in east Africa. 

 (Latin subula, an awl, in reference to the leaves). 



1. S. aquatica L. Stems 1 to 4 inches high, arising from a dense cluster of 

 bright white root-fibres; leaves unequal, erect or slightly spreading, thiekish at 

 the base, i/^ to 11/2 inches long; scape flowering from below the middle, the sub- 

 mersed flowers minute, cleistogamous; pods 1 to 1^/^ lines long, upon short spread- 

 ing pedicels. 



Submersed or growing on muddy banks of ponds, lakes or in running water : 

 coastal San Diego Co. ; Sierra Nevada from Mono Co. to Sierra Co., 7000 to 10,000 

 feet. North to British America; Europe, Asia. 



Locs.— San Diego (Davidson & Moxley, Fl. S. Cal. 153); Mono Pass (Bot. Cal. 1:43); 

 Donner Lake, Sonne; Webber Lake (Gray, Syn. Fl. li:130). 



Eefs. — SUBXJLARIA AQUATICA L. Sp. PI. 642 (1753), type European; Jepson, Man. 441 (1925). 



28. PLATYSPERMUM Hook. 



Low glabrous annual with the leaves in a basal rosette. Flowers minute, soli- 

 tary on naked scapes. Sepals equaling the white petals. Pod suborbicular, flat- 

 tened parallel to the broad partition. Seeds reticulated, broadly winged, in 2 

 rows. — Species 1. (Greek platus, broad, and sperma, seed.) 



1. P. scapigemm Hook. Scapes 1 to 4l^ inches high; leaves lyratelypinnatifid 

 with few lobes or reduced to a single ovate or rhombic lobe; pods 3 to 6 lines long, 

 8 to 12-seeded. 



Moist gravelly places in montane valleys, 2500 to 5500 feet: Mt. Hamilton 

 Range; Sierra Co. to Siskiyou Co. Nevada northerly to Idaho. Feb.-Mar., fr. 

 Mar.-Apr. 



Locs. — Packard Eidge, Mt Hamilton Eange, Mason 7209; Sierra Co., Lemmon (Bot. Cal. 

 1:27) ; Susanville; Big VaUey, Modoc Co., M. S. Baker 76; Goose Lake Valley, B. M. Austin 8; 

 Edgewood, Siskiyou Co., J. W. Kisling; Little Shasta, F. W. Hooper; Yreka, Butler 1136. Nev.: 

 Steamboat Sprs., Sonne 1340. 



